He saw the Messenger of Allah ﷺ raising his hands at the time of beginning the prayer and reciting takbir, and according to Hammam (the narrator), the hands were lifted opposite to ears. He (the Holy Prophet) then wrapped his hands in his cloth and placed his right hand over his left hand. And when he was about to bow down, he brought out his hands from the cloth, and then lifted them, and then recited takbir and bowed down, and when (he came back to the erect position) he recited:" Allah listened to him who praised Him." And when he prostrated, he prostrated between his two palms. (Using translation from Muslim 401)   

أَنَّهُ رَأَى النَّبِيَّ ﷺ حِينَ دَخَلَ فِي الصَّلَاةِ كَبَّرَ قَالَ أَبُو عُثْمَانَ وَصَفَ هَمَّامٌ حِيَالَ أُذُنَيْهِ ثُمَّ الْتَحَفَ بِثَوْبِهِ ثُمَّ وَضَعَ يَدَهُ الْيُمْنَى عَلَى يَدِهِ الْيُسْرَى فَلَمَّا أَرَادَ أَنْ يَرْكَعَ أَخْرَجَ يَدَيْهِ مِنَ الثَّوْبِ وَرَفَعَهُمَا فَكَبَّرَ فَلَمَّا قَالَ سَمِعَ اللهُ لِمَنْ حَمِدَهُ رَفَعَ يَدَيْهِ فَلَمَّا سَجَدَ سَجَدَ بَيْنَ كَفَّيْهِ  

[Machine] That the Prophet ﷺ used to, when he stood up to pray, hold onto his left hand with his right hand, and I saw him doing the alqamah. Ya'qub and Musa Ibn Umair said that he (the Prophet) was a trustworthy Kufan.  

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا قَامَ فِي الصَّلَاةِ قَبَضَ عَلَى شِمَالِهِ بِيَمِينِهِ وَرَأَيْتُ عَلْقَمَةَ يَفْعَلُهُ قَالَ يَعْقُوبُ وَمُوسَى بْنُ عُمَيْرٍ كُوفِيٌّ ثِقَةٌ  

[Machine] He (someone) informed him (someone else). He said, "I said, 'Let me see the Messenger of Allah ﷺ how he prays.'" He said, "So I looked at him, he stood up, said the takbeer (saying Allahu Akbar), and raised his hands until they reached his ears. Then he placed his right hand on the back of his left hand and wrist from the forearm."  

أَخْبَرَهُ قَالَ قُلْتُ لَأَنْظُرَنَّ إِلَى رَسُولِ اللهِ ﷺ كَيْفَ يُصَلِّي قَالَ فَنَظَرْتُ إِلَيْهِ قَامَ وَكَبَّرَ وَرَفَعَ يَدَيْهِ حَتَّى حَاذَتَا بِأُذُنَيْهِ ثُمَّ وَضَعَ يَدَهُ الْيُمْنَى عَلَى ظَهْرِ كَفِّهِ الْيُسْرَى وَالرُّسْغِ مِنَ السَّاعِدِ  

[Machine] That a man places his right hand on his left arm during prayer. Abu Hazim said, "And I know nothing except that he extends it or says a word similar to it."  

أَنْ يَضَعَ الرَّجُلُ يَدَهُ الْيُمْنَى عَلَى ذِرَاعِهِ الْيُسْرَى فِي الصَّلَاةِ قَالَ أَبُو حَازِمٍ وَلَا أَعْلَمُ إِلَّا أَنَّهُ يُنْمِي ذَلِكَ أَوْ كَلِمَةً تُشْبِهُهَا  

AbuUthman an-Nahdi said: When Ibn Mas'ud prayed he placed his left hand on the right. The Prophet ﷺ saw him and placed his right hand on his left one. (Using translation from Abū Dāʾūd 755)   

أَنَّهُ كَانَ يُصَلِّي فَوَضَعَ يَدَهُ الْيُسْرَى عَلَى الْيُمْنَى فَرَآهُ النَّبِيُّ ﷺ فَوَضَعَ يَدَهُ الْيُمْنَى عَلَى الْيُسْرَى  

[Machine] I saw the Messenger of Allah ﷺ placing his right hand on his left hand in prayer. A person called Yazid ibn Qunafa did the same, and we heard from Al-Harith ibn Ghudayf Al-Kindi and Shaddad ibn Shurahbil Al-Ansari that each of them saw the Prophet ﷺ doing the same.  

رَأَيْتُ رَسُولَ اللهِ ﷺ وَاضِعًا يَمِينَهُ عَلَى شِمَالِهِ فِي الصَّلَاةِ هُلْبٌ اسْمُهُ يَزِيدُ بْنُ قُنَافَةَ وَرُوِّينَا عَنِ الْحَارِثِ بْنِ غُضَيْفٍ الْكِنْدِيِّ وَشَدَّادِ بْنِ شُرَحْبِيلَ الْأَنْصَارِيِّ أَنَّ كُلَّ وَاحِدٍ مِنْهُمَا رَأَى النَّبِيَّ ﷺ فَعَلَ ذَلِكَ  

[Machine] He ﷺ said: "Indeed, we, the community of prophets, have been commanded with three things: hastening the breaking of the fast, delaying the pre-dawn meal (suhoor), and placing the right hand over the left hand during prayer." This is a unique narration from Abd al-Majeed and it is only known from Talhah ibn 'Amr, not from a strong source from Ataa' from Ibn Abbas, and once from Abu Hurairah from the Prophet ﷺ , but the authentic narration is from Muhammad ibn Aban al-Ansari from Aisha. She said: "There are three things from prophethood" and then she mentioned them from her own words.  

ﷺ قَالَ إِنَّا مَعَاشِرَ الْأَنْبِيَاءِ أُمِرْنَا بِثَلَاثٍ بِتَعْجِيلِ الْفِطْرِ وَتَأْخِيرِ السَّحُورِ وَوَضْعِ الْيَدِ الْيُمْنَى عَلَى الْيُسْرَى فِي الصَّلَاةِ تَفَرَّدَ بِهِ عَبْدُ الْمَجِيدِ وَإِنَّمَا يُعْرَفُ بِطَلْحَةَ بْنِ عَمْرٍو وَلَيْسَ بِالْقَوِيِّ عَنْ عَطَاءٍ عَنِ ابْنِ عَبَّاسٍ وَمَرَّةً عَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ ﷺ وَلَكِنَّ الصَّحِيحَ عَنْ مُحَمَّدِ بْنِ أَبَانَ الْأَنْصَارِيِّ عَنْ عَائِشَةَ ؓ قَالَتْ ثَلَاثٌ مِنَ النُّبُوَّةِ فَذَكَرَهُنَّ مِنْ قَوْلِهَا  

[Machine] Three acts of prophethood are hastening the breaking of the fast, delaying the pre-dawn meal, and placing the right hand on the left during prayer.  

ثَلَاثٌ مِنَ النُّبُوَّةِ تَعْجِيلُ الْإِفْطَارِ وَتَأْخِيرُ السَّحُورِ وَوَضْعُ الْيَدِ الْيُمْنَى عَلَى الْيُسْرَى فِي الصَّلَاةِ  

[Machine] "From Ali: {So pray to your Lord and sacrifice [to Him alone]}. He said: It is placing your right hand over your left during prayer. This is what our Sheikh Asim al-Jahdari narrated from Uqbah ibn Suhban."  

عَنْ عَلِيٍّ ؓ {فَصَلِّ لِرَبِّكَ وَانْحَرْ} [الكوثر 2] قَالَ هُوَ وَضْعُ يَمِينِكَ عَلَى شِمَالِكَ فِي الصَّلَاةِ كَذَا قَالَ شَيْخُنَا عَاصِمٌ الْجَحْدَرِيُّ عَنْ عُقْبَةَ بْنِ صُهْبَانَ  

[Machine] About Ali {so pray to your Lord and sacrifice [to Him alone]} [Al-Kawthar 2]. He placed his right hand on the middle of his forearm on his chest. Abu Bakr Al-Farisi informed us, who was informed by Abu Ishaq Al-Asbahani, who was informed by Abu Ahmad ibn Faris, who was narrated by Muhammad ibn Ismail Al-Bukhari, may God have mercy on him, who said Musa narrated to us, who was narrated by Hammad ibn Salama, who mentioned him, he said, Al-Bukhari said to us, and Qutayba said to us, from Humeid ibn Abdul Rahman, from Yazid ibn Ziyad ibn Abi Al Ja'd, from Asim Al Jahdari, from Ubay ibn Ka'b from the companions of Ali, from Ali. And both of them placed it on the armrest.  

عَنْ عَلِيٍّ {فَصَلِّ لِرَبِّكَ وَانْحَرْ} [الكوثر 2] وَضْعُ يَدِهِ الْيُمْنَى عَلَى وَسَطِ سَاعِدِهِ عَلَى صَدْرِهِ أَخْبَرَنَاهُ أَبُو بَكْرٍ الْفَارِسِيُّ أنبأ أَبُو إِسْحَاقَ الْأَصْبَهَانِيُّ أنبأ أَبُو أَحْمَدَ بْنُ فَارِسٍ ثنا مُحَمَّدُ بْنُ إِسْمَاعِيلَ الْبُخَارِيُّ رَحِمَهُ اللهُ قَالَ أنبأ مُوسَى ثنا حَمَّادُ بْنُ سَلَمَةَ فَذَكَرَهُ قَالَ وَقَالَ الْبُخَارِيُّ وَقَالَ لَنَا قُتَيْبَةُ عَنْ حُمَيْدِ بْنِ عَبْدِ الرَّحْمَنِ عَنْ يَزِيدَ بْنِ زِيَادِ بْنِ أَبِي الْجَعْدِ عَنْ عَاصِمٍ الْجَحْدَرِيِّ عَنْ عُقْبَةَ مِنْ أَصْحَابِ عَلِيٍّ عَنْ عَلِيٍّ ؓ وَضَعَهُمَا عَلَى الْكُرْسُوعِ  

[Machine] Ali used to start his prayer by raising his hands and saying "Allahu Akbar" (God is the greatest), then he would strike his left wrist with his right hand. He would continue to do this until he bowed down, unless his skin itched or his garment needed adjustment. After finishing the prayer, he would say the salutation ("As-salamu 'alaykum") with his right hand and then turn his head to the left, moving his lips without making any sound. We don't know exactly what he said. Then he would say "La ilaha illallah wahdahu la sharika lah, la haula wala quwwata illa billah" (There is no god but Allah alone, with no partner or associate. There is no power or strength except with Allah. We worship none but Him). Finally, he would face the people and not pay attention to his right or left side. This is a sound and reliable narration.  

كَانَ عَلِيٌّ ؓ إِذَا قَامَ إِلَى الصَّلَاةِ فَكَبَّرَ ضَرَبَ بِيَدِهِ الْيُمْنَى عَلَى رُسْغِهِ الْأَيْسَرِ فَلَا يَزَالُ كَذَلِكَ حَتَّى يَرْكَعَ إِلَّا أَنْ يَحُكَّ جِلْدًا أَوْ يَصْلُحَ ثَوْبَهُ فَإِذَا سَلَّمَ سَلَّمَ عَنْ يَمِينِهِ سَلَامٌ عَلَيْكُمْ ثُمَّ يَلْتَفِتُ عَنْ شِمَالِهِ فَيُحَرِّكُ شَفَتَيْهِ فَلَا نَدْرِي مَا يَقُولُ ثُمَّ يَقُولُ لَا إِلَهَ إِلَّا اللهُ وَحْدَهُ لَا شَرِيكَ لَهُ لَا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللهِ لَا نَعْبُدُ إِلَّا إِيَّاهُ ثُمَّ يُقْبِلُ عَلَى الْقَوْمِ بِوَجْهِهِ فَلَا يُبَالِي عَلَى يَمِينِهِ انْصَرَفَ أَوْ عَنْ شِمَالِهِ هَذَا إِسْنَادٌ حَسَنٌ  

I heard Ibn al-Zubair say: Setting the feet right and placing one hand on the other is a sunnah. (Using translation from Abū Dāʾūd 754)   

سَمِعْتُ ابْنَ الزُّبَيْرِ يَقُولُ صَفُّ الْقَدَمَيْنِ وَوَضْعُ الْيَدِ عَلَى الْيَدِ مِنَ السُّنَّةِ