Muwatta Malik 388
موطأ مالك#388Sahihوَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ عَامِرِ بْنِ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ، عَنْ عَمْرِو بْنِ سُلَيْمٍ الزُّرَقِيِّ، عَنْ أَبِي قَتَادَةَ الأَنْصَارِيِّ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا دَخَلَ أَحَدُكُمُ الْمَسْجِدَ فَلْيَرْكَعْ رَكْعَتَيْنِ قَبْلَ أَنْ يَجْلِسَ " .
Yahya related to me from Malik from Amir ibn Abdullah ibn az- Zubayr from Amr ibn Sulaymaz-Zuraqi from Abu Qatadaal-Ansari that the Messenger of Allah, may Allah bless him and grant him peace, said, "When you enter the mosque, you should pray two rakas before you sit down
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 9:63