Musannaf Ibn Abi Shayba 3:5390

Abu Usama narrated to us, from Musa bin Abdullah bin Ishaq bin Talha, from Musa bin Talha, who said: Talha used to remain firm in his place of prayer where he had prayed, and he would not depart until the *subha* (voluntary prayer) arrived, so he would perform the *subha*.