Sayyiduna Ali (may Allah be pleased with him) says: The Messenger of Allah (peace and blessings be upon him) would sometimes perform Witr in the early part of the night, sometimes in the middle part, and at times in the last part of the night. Later on, the Witr of the Messenger of Allah (peace and blessings be upon him) would be in the last part of the night only.
Hadith Referenceالفتح الربانی / أبواب صلاة الليل والوتر / 2181
Hadith Gradingمحدثین:صحیح
Hadith Takhrij«اسناده قوي۔ أخرجه ابن ماجه: 1186 ، (انظر مسند أحمد ترقيم الرسالة: 653 ترقیم بيت الأفكار الدولية: 1218»
Brief Explanation
Benefits: … This hadith is also found in other places in Musnad Ahmad, in which the last sentence appears with these words: "fa intaha witruhu ila al-sahar" or "wa intaha witruhu ila akhir al-layl," meaning that the time of the Prophet's (sallallahu alayhi wa sallam) performance of the witr prayer would reach until sahar (pre-dawn) or until the last part of the night.