Sunan Abu Dawud Hadith 1429

Umar Ibn al-Khattab رضی اللہ عنہ gathered the people (in tarawih prayer) behind Ubayy Ibn Kab رضی اللہ عنہ (who led them). He used to lead them for twenty days (during Ramadan, and would not recite the supplication except in the second half of it (i.e. Ramadan). When the last ten days remained, he kept away from them, and prayed in his house. They used to say: Ubayy ran away. Abu Dawud said: This tradition shows that whatever has been reported about the recitation of the supplication is not tenable. Moreover, these two traditions from Ubayy bin Kab رضی اللہ عنہ indicate that another tradition which tells that the Prophet صلی ‌اللہ ‌علیہ ‌وسلم recited the supplication in the witr is weak.