صحیح ابن حبان
Ibn Hibban
كتاب الصلاة
Book of Prayer
باب النوافل - ذكر الخبر المدحض قول من زعم أن على الداخل المسجد بعد أن أقيمت صلاة الغداة أن يبدأ بركعتي الفجر وإن فاتته ركعة واحدة من فرضه
Section on voluntary prayers – mentioning a report refuting the claim that one entering the mosque after the morning prayer has started should begin with the two rak’ahs of Fajr even if he misses a rak’ah of the obligatory prayer
1 hadith
Hadith 2470
Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Prophet Muhammad (peace and blessings be upon him) said: "When the Iqamah for prayer is called, only the obligatory prayer may be performed."