Hadith #453
Ungraded
Chapter: The Book of Virtues
كتاب الفضائل
Arabic Text
عن علي رضي الله عنه قال: الوتر ليس بختم كصلاة المكتوبة ولكن سن رسول الله صلى الله عليه وسلم قال: "إن الله وتر يحب الوتر، فأوتروا يا أهل القرآن". ((رواه أبو داود والترمذي)). وقال: حديث حسن.
English Translation
'Ali (bin Abu Talib) (may Allah be pleased with him) reported: The Witr prayer is not obligatory as the prescribed Salat (prayers), but the Messenger of Allah ﷺ observed it as his regular practice (Sunnah). He (ﷺ) said, "Allah is Witr (single, odd) and loves what is Witr. So perform Witr prayer. O followers of Qur'an, observe Witr (prayer).".
Quran References
Reference: Riyadh al-Salihin, Book 8, Hadith 453
Sunnah.com ref: riyadh-salihin 453
Islam.wiki ID: IWH-67291