The Book of the Masjids
8/37. Chapter:
The Command To Pray Before Sitting Down In It
Sunan an-Nasai
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا مَالِكٌ، عَنْ عَامِرِ بْنِ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ، عَنْ عَمْرِو بْنِ سُلَيْمِ، عَنْ أَبِي قَتَادَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا دَخَلَ أَحَدُكُمُ الْمَسْجِدَ فَلْيَرْكَعْ رَكْعَتَيْنِ قَبْلَ أَنْ يَجْلِسَ " .
It was narrated from Abu Qatadah that the Messenger of Allah (ﷺ) said: "When any one of you enters the Masjid, let him pray two Rak'ahs before he sits down."
Reference : Sunan an-Nasa'i 730In-book reference : Book 8, Hadith 43English translation : Vol. 1, Book 8, Hadith 731