when we (prayed and) sat up during prayer along the Messenger of Allah (may peach be upon him), we said: “Peace be to Allah before it is supplicated for His servants; peace be to so and so. “The Messenger of Allah ﷺ said: Do not say “Peace be to Allah ,”for Allah Himself is peace. When one of you sits(during the prayer), he should say: The adoration of the tongue are due to Allah, and acts of worship and all good things. Peace be upon you, O Prophet, and Allah’s mercy and His blessings. Peace be upon us and upon Allah’s upright servants. When you say that, it reaches every upright servant in heavens and earth or between heavens and earth. I testify that there is no god but Allah, and I testify that Muhammad is His servant and apostle. Then he may choose any supplication which pleases him and offer it. (Using translation from Abū Dāʾūd 968)   

قَالَ عَبْدُ اللهِ بْنُ مَسْعُودٍ ؓ كُنَّا إِذَا صَلَّيْنَا خَلْفَ رَسُولِ اللهِ ﷺ قُلْنَا السَّلَامُ عَلَى اللهِ دُونَ عِبَادِهِ السَّلَامُ عَلَى جَبْرَائِيلَ وَمِيكَائِيلَ وَالسَّلَامُ عَلَى فُلَانٍ وَفُلَانٍ فَالْتَفَتَ إِلَيْنَا رَسُولُ اللهِ ﷺ فَقَالَ إِنَّ اللهَ هُوَ السَّلَامُ إِذَا صَلَّى أَحَدُكُمْ فَلْيَقُلْ التَّحِيَّاتُ لِلَّهِ وَالصَّلَوَاتُ وَالطَّيِّبَاتُ السَّلَامُ عَلَيْكَ أَيُّهَا النَّبِيُّ وَرَحْمَةُ اللهِ وَبَرَكَاتُهُ السَّلَامُ عَلَيْنَا وَعَلَى عِبَادِ اللهِ الصَّالِحِينَ فَإِنَّكُمْ إِذَا قُلْتُمُوهَا أَصَابَتْ كُلَّ عَبْدٍ صَالِحٍ لِلَّهِ فِي السَّمَاءِ وَالْأَرْضِ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ  

We used to pray behind the Prophet ﷺ and used to say: "As-Salamu 'Al-Allah. The Prophet ﷺ said, "Allah himself is As-Salam (Name of Allah), so you should say: 'at-Tahiyatu lil-lahi was-sala-watu wattaiyibatu, as-salamu ʿalaika aiyyuha-n-nabiyyu wa rahmatu-l-lahi wa barakatuhu, as-salamu ʿalaina wa ʿala ʿibadi-l-lahi as-salihin. Ashhadu an la ilaha il-lallah, wa ash-hadu anna Muhammadan ʿabduhu wa rasuluhu."' (Using translation from Bukhārī 7381)   

أَنْ يُفْرَضَ التَّشَهُّدُ السَّلَامُ عَلَى اللهِ السَّلَامُ عَلَى جَبْرَائِيلَ وَمِيكَائِيلَ فَقَالَ رَسُولُ اللهِ ﷺ لَا تَقُولُوا هَكَذَا فَإِنَّ اللهَ هُوَ السَّلَامُ وَلَكِنْ قُولُوا التَّحِيَّاتُ لِلَّهِ وَالصَّلَوَاتُ وَالطَّيِّبَاتُ السَّلَامُ عَلَيْكَ أَيُّهَا النَّبِيُّ وَرَحْمَةُ اللهِ وَبَرَكَاتُهُ السَّلَامُ عَلَيْنَا وَعَلَى عِبَادِ اللهِ الصَّالِحِينَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ قَالَ عَلِيٌّ هَذَا إِسْنَادٌ صَحِيحٌ  

Messenger of Allah ﷺ taught me the Tashah-hud as he taught me a Sura from the Qur'an, while my hand was between his hands. (Tashah-hud was) all the best compliments and the prayers and the good things are for Allah. Peace and Allah's Mercy and Blessings be on you, O Prophet! Peace be on us and on the pious slaves of Allah, I testify that none has the right to be worshipped but Allah, and I also testify that Muhammad is Allah's slave and His Apostle. (We used to recite this in the prayer) during the lifetime of the Prophet ﷺ , but when he had died, we used to say, "Peace be on the Prophet." (Using translation from Bukhārī 6265)   

سَمِعْتُ عَبْدَ اللهِ بْنَ مَسْعُودٍ يَقُولُ عَلَّمَنِي رَسُولُ اللهِ ﷺ التَّشَهُّدَ كَفِّي بَيْنَ كَفَّيْهِ كَمَا يُعَلِّمُنِي السُّورَةَ مِنَ الْقُرْآنِ التَّحِيَّاتُ لِلَّهِ وَالصَّلَوَاتُ وَالطَّيِّبَاتُ السَّلَامُ عَلَيْكَ أَيُّهَا النَّبِيُّ وَرَحْمَةُ اللهِ وَبَرَكَاتُهُ السَّلَامُ عَلَيْنَا وَعَلَى عِبَادِ اللهِ الصَّالِحِينَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ وَهُوَ بَيْنَ ظَهْرَانَيْهِمْ فَلَمَّا قُبِضَ قُلْنَا السَّلَامُ عَلَى النَّبِيِّ  

[Machine] "From the Messenger of Allah, ﷺ , regarding the Tashahhud: the greetings are for Allah, and the prayers and good deeds. Peace be upon you, O Prophet, and the mercy of Allah. Ibn Umar said: 'I added to it: peace be upon us and upon the righteous servants of Allah. I bear witness that there is no god but Allah.' Ibn Umar said: 'I added to it alone, with no partner. And I bear witness that Muhammad is His servant and Messenger.' This is a narration of Abu Dawud, reported by Ibn Abi Adiyah from Shu'bah, except that he attributed it to the life of the Prophet, ﷺ . He said: 'We used to say it during his lifetime, but when he died, we said: peace be upon the Prophet and the mercy of Allah.' And Muhammad ibn Isma'il al-Bukhari said that the narration of Saif from Mujahid, from Abu Ma'mar, from Abdullah ibn Mas'ood, is preserved without the narration of Abu Bishr. And Allah knows best. It is also narrated from Abdullah ibn Babyy, from Ibn Umar, from the Prophet, ﷺ , with similar wording, except that he ended his statement with 'for Allah' and added to the original."

Note: The translation of the passage may not be an exact word-for-word translation, but it captures the content and meaning of the original Arabic text.  

عَنْ رَسُولِ اللهِ ﷺ فِي التَّشَهُّدِ التَّحِيَّاتُ لِلَّهِ وَالصَّلَوَاتُ وَالطَّيِّبَاتُ السَّلَامُ عَلَيْكَ أَيُّهَا النَّبِيُّ وَرَحْمَةُ اللهِ قَالَ قَالَ ابْنُ عُمَرَ زِدْتُ فِيهَا وَبَرَكَاتُهُ السَّلَامُ عَلَيْنَا وَعَلَى عِبَادِ اللهِ الصَّالِحِينَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ قَالَ ابْنُ عُمَرَ زِدْتُ فِيهَا وَحْدَهُ لَا شَرِيكَ لَهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ لَفْظُ حَدِيثِ أَبِي دَاوُدَ وَرَوَاهُ ابْنُ أَبِي عَدِيٍّ عَنْ شُعْبَةَ فَوَقَفَهُ إِلَّا أَنَّهُ رَدَّهُ إِلَى حَيَاةِ النَّبِيِّ ﷺ فَقَالَ كُنَّا نَقُولُهَا فِي حَيَاتِهِ فَلَمَّا مَاتَ قُلْنَا السَّلَامُ عَلَى النَّبِيِّ وَرَحْمَةُ اللهِ وَكَانَ مُحَمَّدُ بْنُ إِسْمَاعِيلَ الْبُخَارِيُّ يَرَى رِوَايَةَ سَيْفٍ عَنْ مُجَاهِدٍ عَنْ أَبِي مَعْمَرٍ عَنْ عَبْدِ اللهِ بْنِ مَسْعُودٍ هِيَ الْمَحْفُوظَةَ دُونَ رِوَايَةِ أَبِي بِشْرٍ وَاللهُ تَعَالَى أَعْلَمُ وَرُوِيَ عَنْ عَبْدِ اللهِ بْنِ بَابِي عَنِ ابْنِ عُمَرَ عَنِ النَّبِيِّ ﷺ عَنْهُ كَذَا إِلَّا أَنَّهُ أَخَّرَ قَوْلَهُ لِلَّهِ وَزَادَ فِي الْأَصْلِ وَبَرَكَاتُهُ وَرُوِيَ عَنْ زَيْدٍ الْعَمِّيِّ عَنْ أَبِي الصِّدِّيقِ النَّاجِيِّ عَنِ ابْنِ عُمَرَ عَنْ أَبِي بَكْرٍ الصِّدِّيقِ مُخْتَصَرًا  

[Machine] The Messenger of Allah ﷺ said, "When the Imam sits in the last Rak'ah of his prayer, then speaks before saying the Tashahhud, his prayer is invalidated, and this is a weak narration reported by Al-Qa'nabi from Al-Ifrigi."  

قَالَ رَسُولُ اللهِ ﷺ إِذَا قَعَدَ الْإِمَامُ فِي آخِرِ رَكْعَةٍ مِنْ صَلَاتِهِ ثُمَّ أَحْدَثَ قَبْلَ أَنْ يَتَشَهَّدَ فَقَدْ تَمَّتْ صَلَاتُهُ فَهُوَ حَدِيثٌ ضَعِيفٌ وَرَوَاهُ الْقَعْنَبِيُّ عَنِ الْإِفْرِيقِيِّ  

[Machine] The Messenger of Allah ﷺ said: "If a person raises his head from prostration at the end of his prayer and speaks before saying the salaam, then his prayer is valid. And like this."  

قَالَ رَسُولُ اللهِ ﷺ إِذَا رَفَعَ الرَّجُلُ رَأْسَهُ مِنَ السُّجُودِ فِي آخِرِ صَلَاتِهِ ثُمَّ أَحْدَثَ قَبْلَ أَنْ يُسَلِّمَ فَقَدْ جَازَتْ صَلَاتُهُ وَهَكَذَا  

[Machine] From Ali, he said: When one sits the duration of the tashahhud and then speaks, their prayer is completed and it is not valid. And Aasim ibn Damrah has no valid proof for it.  

عَنْ عَلِيٍّ مِنْ قَوْلِهِ إِذَا جَلَسَ مِقْدَارَ التَّشَهُّدِ ثُمَّ أَحْدَثَ فَقَدْ تَمَّتْ صَلَاتُهُ لَا يَصِحُّ وَعَاصِمُ بْنُ ضَمْرَةَ غَيْرُ مُحْتَجٍّ بِهِ  

[Machine] It is not correct.  

لَا يَصِحُّ