Musannaf Ibn Abi Shayba 3:6239

Shababa narrated to us, he said: Shu'ba narrated to us, he said: Hayyan al-Azdi narrated to us, he said: I heard Ibn Umar, and he was asked about the middle prayer, and it was said to him that Abu Hurayra says it is the Asr (afternoon) prayer. He said: "Abu Hurayra talks too much." Ibn Umar says it is the Subh (morning) prayer.