Jabir reported: The Messenger of Allah, peace and blessings be upon him, said, “Whoever fears he cannot stand for prayer at the end of the night, let him perform Witr prayer in its beginning. Whoever hopes to stand for prayer at the end of the night, let him perform Witr prayer at its ending. Verily, prayer at the end of the night is witnessed, and that is better.”
Source: Ṣaḥīḥ Muslim 755
Grade: Sahih (authentic) according to Muslim
عَنْ جَابِرٍ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَنْ خَافَ أَنْ لَا يَقُومَ مِنْ آخِرِ اللَّيْلِ فَلْيُوتِرْ أَوَّلَهُ وَمَنْ طَمِعَ أَنْ يَقُومَ آخِرَهُ فَلْيُوتِرْ آخِرَ اللَّيْلِ فَإِنَّ صَلَاةَ آخِرِ اللَّيْلِ مَشْهُودَةٌ وَذَلِكَ أَفْضَلُ
755 صحيح مسلم كتاب صلاة المسافرين وقصرها باب من خاف أن لا يقوم من آخر الليل فليوتر أوله