It is narrated from Hazrat Aisha (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) offered Witr in the beginning, middle, and last part of the night, and his Witr would reach up to the time of Suhoor, until he passed away.
Hadith Referenceمسند احمد / مسند النساء / 24974
Hadith Gradingحکم دارالسلام:هذا الحديث له إسنادان: الإسناد الأول حسن، والاسناد الثاني صحيح، م: 745