Arabic (Original)
قَالَ حَدَّثَنَا أَبُو عَامِرٍ قَالَ حَدَّثَنَا سُلَيْمَانُ بْنُ بِلَالٍ عَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ عَنْ عَبْدِ الْمَلِكِ بْنِ سَعِيدِ بْنِ سُوَيْدٍ الْأَنْصَارِيِّ قَالَ سَمِعْتُ أَبَا حُمَيْدٍ وَأَبَا أُسَيْدٍ يَقُولَانِ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا دَخَلَ أَحَدُكُمْ الْمَسْجِدَ فَلْيَقُلْ اللَّهُمَّ افْتَحْ لَنَا أَبْوَابَ رَحْمَتِكَ وَإِذَا خَرَجَ فَلْيَقُلْ اللَّهُمَّ إِنِّي أَسْأَلُكَ مِنْ فَضْلِكَ.
English Translation
He said: Abu Amir told us: Sulayman ibn Bilal told us, from Rabi'ah ibn Abi Abd al-Rahman, from Abd al-Malik ibn Sa'id ibn Suwayd al-Ansari, who said: I heard Abu Humayd and Abu Usayd say: The Messenger of Allah, peace and blessings be upon him, said, 'When one of you enters the mosque, let him say: O Allah, open for us the gates of Your mercy. And when he leaves, let him say: O Allah, I ask You of Your bounty.'