[Machine] The Messenger of Allah ﷺ said, "When one of you enters the mosque, he should greet (say salaam) and say, 'O Allah, open the doors of Your mercy for me.' And when he exits, he should say, 'O Allah, I ask You for Your favor (grace).'"

Narrated Abu 'Abdur-Rahman As-Sulami: Abu Mansur Muhammad bin Al-Qasim Al-'Ataki informed us, narrating from Al-Hasan bin 'Abdus-Samad Al-Quhundi, who narrated from Yahya bin Yahya, who informed us that Sulaiman bin Bilal narrated to us, and he mentioned it in a similar manner except that he did not mention the part about saying salaam.  

قَالَ رَسُولُ اللهِ ﷺ إِذَا دَخَلَ أَحَدُكُمُ الْمَسْجِدَ فَلْيُسَلِّمْ وَلْيَقُلِ اللهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ وَإِذَا خَرَجَ فَلْيَقُلِ اللهُمَّ إِنِّي أَسْأَلُكَ مِنْ فَضْلِكَ 4318 وَثنا أَبُو عَبْدِ الرَّحْمَنِ السُّلَمِيُّ أنبأ أَبُو مَنْصُورٍ مُحَمَّدُ بْنُ الْقَاسِمِ يَعْنِي الْعَتَكِيَّ ثنا الْحَسَنُ بْنُ عَبْدِ الصَّمَدِ الْقُهُنْدَزِيُّ ثنا يَحْيَى بْنُ يَحْيَى أنبأ سُلَيْمَانُ بْنُ بِلَالٍ ثنا رَبِيعَةُ بْنُ أَبِي عَبْدِ الرَّحْمَنِ فَذَكَرَهُ بِنَحْوِهِ إِلَّا أَنَّهُ لَمْ يَقُلْ فَلْيُسَلِّمْ  

when any of you enters the mosque he should invoke blessing on the prophet ﷺ and then he should say: O Allah, open to me the gates of thy mercy. And when he goes out, he should say: O Allah, I ask thee out of Thine abundance. (Using translation from Abū Dāʾūd 465)   

قَالَ رَسُولُ اللهِ ﷺ إِذَا دَخَلَ أَحَدُكُمُ الْمَسْجِدَ فَلْيُسَلِّمْ عَلَى النَّبِيِّ ﷺ ثُمَّ لِيَقُلِ اللهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ وَإِذَا خَرَجَ فَلْيَقُلِ اللهُمَّ إِنِّي أَسْأَلُكَ مِنْ فَضْلِكَ  

[Machine] From Rabi'ah ibn Abi Abd al-Rahman, he mentioned it in a similar manner, then added, "So let him offer greetings of peace upon the Prophet ﷺ or let him send prayers upon him."  

عَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ فَذَكَرَهُ بِنَحْوِهِ فَزَادَ فَلْيُسَلِّمْ أَوْ لِيُصَلِّ عَلَى النَّبِيِّ ﷺ  

"The Messenger of Allah said: 'When anyone of you enters the mosque, let him send peace upon the prophet, then let him say: "Allahummaftah li abwaba rahmatika (O Allah, open to me the gates of Your mercy)." And when he leaves, let him say: "Allahumma inni as'aluka min fadlika. (O Allah, I ask of you from Your bounty)." (Using translation from Ibn Mājah 772)   

أَنَّ رَسُولَ اللهِ ﷺ قَالَ إِذَا دَخَلَ أَحَدُكُمُ الْمَسْجِدَ فَلْيُسَلِّمْ عَلَى النَّبِيِّ ﷺ وَلْيَقُلِ اللهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ وَإِذَا خَرَجَ فَلْيُسَلِّمْ عَلَى النَّبِيِّ ﷺ وَلْيَقُلِ اللهُمَّ أَجِرْنِي مِنَ الشَّيْطَانِ الرَّجِيمِ  

[Machine] To begin with your left foot, Shaddad ibn Sa'id Abu Talhah Al-Rasibiy excelled with it, but it is not the strongest.  

أَنْ تَبْدَأَ بِرِجْلِكَ الْيُسْرَى تَفَرَّدَ بِهِ شَدَّادُ بْنُ سَعِيدٍ أَبُو طَلْحَةَ الرَّاسِبِيُّ وَلَيْسَ بِالْقَوِيِّ