Musannaf Ibn Abi Shayba 3:5297

Abu Usama narrated to us, from Nafi’ ibn ‘Umar, who said: I heard Ibn Abi Mulaykah saying: I used to lead the people in prayer during the month of Ramadan, and I would recite in the rak’ah "Al-Hamdu lillahi Fatir" (Surah Fatir) and the like. And it did not reach me that anyone considered that to be too little.