The Prophet (sallallahu alayhi wa sallam) said: “Make the last of your prayer at night Witr (an odd number).”.
وَعَنْ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا; عَنْ
اَلنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «اِجْعَلُوا آخِرَ صَلَاتِكُمْ بِاللَّيْلِ وِتْرًا»
The Prophet (sallallahu alayhi wa sallam) said: “Make the last of your prayer at night Witr (an odd number).”.
صحيح. رواه البخاري (998)، ومسلم (751) (151)
Who passed it on, from Ibn Hajar back to the one who was there.
The same words, in another collection.
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