Sahih Muslim · Hadith 1763

حدثنا أبو بكر بن أبي شيبة، وأبو كريب قالا حدثنا يحيى بن آدم، حدثنا عمار بن رزيق، عن أبي إسحاق، عن الأسود، عن عائشة، قالت كان رسول الله صلى الله عليه وسلم يصلي من الليل حتى يكون آخر صلاته الوتر ‏.‏

Masruq is reported to have asked 'A'isha about the action (most pleasing to) the Messenger of Allah (may peace be upon him). She said: He (the Holy Prophet) loved (that action) which one keeps on doing regularly. I said (to 'A'isha): When did he pray (at night)? She replied: When he heard the cock crow, he got up and observed prayer.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).