Sunan an-Nasa'i · Hadith 1635
The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day - كتاب قيام الليل وتطوع النهار
أخبرنا محمد بن عبد الأعلى، قال حدثنا معتمر، عن أبيه، عن أنس، أن النبي صلى الله عليه وسلم ليلة أسري به مر على موسى عليه السلام وهو يصلي في قبره .
It was narrated from Anas that: On the night on which he was taken on the Night Journey, the Prophet (ﷺ) passed by Musa, peace be upon him, and he was praying in his grave.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).