'Aishah (May Allah be pleased with her) reported:
The Messenger of Allah (ﷺ) observed Witr prayer in every part of night at the beginning, middle and at the last part. He (ﷺ), however, would finish his Witr prayer before dawn.[Al-Bukhari and Muslim].
App reference: Book 9, Hadith 143
Arabic/English book reference: Book 9, Hadith 1133