صحیح ابن حبان
Ibn Hibban
كتاب الصلاة
Book of Prayer
فصل في الأوقات المنهي عنها - ذكر العلة التي من أجلها صلى رسول الله صلى الله عليه وسلم هاتين الركعتين في ابتداء الأمر
Section on Prohibited Times - The reason why the Prophet prayed these two rak’ahs at the beginning.
1 hadith
Hadith 1574
Sayyida Umm Salamah (may Allah be pleased with her) narrates: When the Prophet Muhammad (peace be upon him) was unable to perform the two rak‘ahs after Zuhr due to some engagements, he would perform them after ‘Asr.