Abd Khayr reported,
Ali bin Abu Talib 
came out to us while we were in the mosque and asked, "Where is the one who was asking about the witr prayer?"Anyone among us who was in the middle of a single rakah added another to it to make it even, and we gathered around him.He said, "The Messenger of Allah ﷺ used to perform witr at the beginning of the night, then he performed it in the middle of the night, then he settled on performing witr at this hour."And that was at the break of dawn.
Ahmad 974
Daifحدثنا غسان بن الربيع حدثنا أبو إسرائيل عن السدي
عن عبد خير قال
خرج علينا علي بن أبي طالب رضي الله عنه ونحن في المسجد فقال أين السائل عن الوتر فمن كان منا في ركعة شفع إليها أخرى حتى اجتمعنا إليه فقال إن رسول الله ﷺ كان يوتر في أول الليل ثم أوتر في وسطه ثم أثبت الوتر في هذه الساعة قال وذلك عند طلوع الفجر
Its isnad is daif. Ghassan bin Rabi Azdi, Hafiz said in Tajil, Ibn Hibban mentioned him in ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??Abu Israil, he is Mulai, with the meem pronounced with damma and the lam unshaddaded, and his name is Ismail bin Abu Ishaq Khalifah Absi. Many declared him daif, among them Nasai, who said in Duafa, "He is not trustworthy." Bukhari said in Kabir 1/1/346, "Abu Walid," meaning Tayalisi, "declared him daif." He also said, "Ibn Mahdi abandoned him," and he said something similar in Sagheer 187.The hadith is lengthy, 929.