Muwatta Malik #273
Tahajjud
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عَائِشَةَ، زَوْجَ النَّبِيِّ صلى الله عليه وسلم كَانَتْ تَقُولُ مَنْ خَشِيَ أَنْ يَنَامَ حَتَّى يُصْبِحَ فَلْيُوتِرْ قَبْلَ أَنْ يَنَامَ وَمَنْ رَجَا أَنْ يَسْتَيْقِظَ آخِرَ اللَّيْلِ فَلْيُؤَخِّرْ وِتْرَهُ .
Yahya related to me from Malik that he had heard that A'isha, the
wife of the Prophet, may Allah bless him and grant him peace, used to
say, "If someone fears that he will sleep through till the morning,
let him pray the witr before he sleeps, and if some one hopes to wake
for the last part of the night, let him delay his witr."
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About Muwatta Malik
This hadith is #273 from Muwatta Malik, in the Book of Tahajjud.