Sahih Muslim 742
Sahih Muslim · Book 6: The Book of Prayer - Travellers · Night prayers and the number of rak`ah offered by the Prophet (saws) at night, and that Witr is one rak`ah, and a one-rak`ah prayer is correct
'A'isha reported:
حَدَّثَنَا أَبُو كُرَيْبٍ ، أَخْبَرَنَا ابْنُ بِشْرٍ ، عَنْ مِسْعَرٍ ، عَنْ سَعْدٍ ، عَنْ أَبِي سَلَمَةَ ، عَنْ عَائِشَةَ ، قَالَتْ مَا أَلْفَى رَسُولَ اللَّهِ صلى الله عليه وسلم السَّحَرُ الأَعْلَى فِي بَيْتِي - أَوْ عِنْدِي - إِلاَّ نَائِمًا .
Never did the earlier part of the dawn find the Messenger of Allah (ﷺ) but sleeping in my house or near me.