Sahih al-Bukhari 4176
Narrated Abu Jamra:
I asked Aidh bin `Amr, who was one of the companions of the Prophet (ﷺ) one of those (who gave the 
allegiance to the Prophet (ﷺ) the Tree: "Can the witr prayer be repeated (in one night)?" He said, "If you 
have offered it in the first part of the night, you should not repeat it in the last part 'of the night." (See 
Fath-ul-Bari page 458 Vol 8th).
حَدَّثَنَا مُحَمَّدُ بْنُ حَاتِمِ بْنِ بَزِيعٍ، حَدَّثَنَا شَاذَانُ، عَنْ شُعْبَةَ، عَنْ أَبِي جَمْرَةَ، قَالَ سَأَلْتُ عَائِذَ بْنَ عَمْرٍو ـ رضى الله عنه ـ وَكَانَ مِنْ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم مِنْ أَصْحَابِ الشَّجَرَةِ هَلْ يُنْقَضُ الْوِتْرُ قَالَ إِذَا أَوْتَرْتَ مِنْ أَوَّلِهِ، فَلاَ تُوتِرْ مِنْ آخِرِهِ‏.‏