صحیح ابن حبان
Ibn Hibban
كتاب الصلاة
Book of Prayer
باب النوافل - ذكر البيان بأن المرء إنما أمر بركعتين عند دخوله المسجد قبل الجلوس والاستخبار
Section on voluntary prayers – clarification that the instruction is to pray two rak’ahs upon entering the mosque before sitting or asking
1 hadith
Hadith 2499
Sayyiduna Abu Qatadah narrates this statement of the Noble Prophet (peace and blessings be upon him): "When a person enters the mosque, he should perform two rak‘ahs before sitting down." (Regarding one word here, the narrator is in doubt.)