حَدَّثَنَا أَحْمَدُ بْنُ مُحَمَّدِ بْنِ حَنْبَلٍ، حَدَّثَنَا مُحَمَّدُ بْنُ بَكْرٍ، أَخْبَرَنَا هِشَامٌ، عَنْ مُحَمَّدٍ، عَنْ بَعْضِ، أَصْحَابِهِ أَنَّ أُبَىَّ بْنَ كَعْبٍ، أَمَّهُمْ - يَعْنِي فِي رَمَضَانَ - وَكَانَ يَقْنُتُ فِي النِّصْفِ الآخِرِ مِنْ رَمَضَانَ ‏.‏

Muhammad reported on the authority of some of his teachers that Ubayy b. Ka'b led them in prayer during Ramadan. He used to recite the supplication (in the witr) during the second half of Ramadan. Translation Not Available

Book Ref: Sunan Abi Dawud Book 8 Hadith 1428
Web Ref:  Sunan Abi Dawud Book 8 Hadith 1423