Musannaf Ibn Abi Shayba 3:4973

Affan narrated to us, he said: Abu Awanah narrated to us, he said: Ibrahim ibn Muhammad ibn al-Muntashir narrated to us, from Abu Talhah and Ibn Shurayh, he said: Shurayh used to pray two rak'ahs after the Asr prayer; he took them from Masruq.