The Prophet (sallallahu alayhi wa sallam) said: “Offer Witr prayer before it is morning.”.
وَعَنْ أَبِي سَعِيدٍ اَلْخُدْرِيِّ رضى الله عنه
أَنَّ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «أَوْتِرُوا قَبْلَ أَنْ تُصْبِحُوا»
The Prophet (sallallahu alayhi wa sallam) said: “Offer Witr prayer before it is morning.”.
صحيح. رواه مسلم (754)
Who passed it on, from Ibn Hajar back to the one who was there.
The same words, in another collection.
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