Hadith: Perform Witr prayer before the morning

عن أبي سعيد الخدري رضي الله عنه أن النبي صلى الله عليه وسلم قال: «أَوْتِرُوا قبل أن تُصبحِوُا».
[صحيح] - [رواه مسلم]

Abu Sa‘īd al-Khudri (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "Perform Witr prayer before the morning."
Sahih/Authentic. - [Muslim]

Explanation

Witr prayer is the last part of the night prayers exactly as Maghrib prayer is the last prayer performed during the daytime, so that it ends with an odd number prayer. The noble Hadīth indicates that the time period for Witr prayer is before the break of the second dawn.