Musannaf Ibn Abi Shayba 3:3265

Malik ibn Isma'il narrated to us, he said: Zuhayr narrated to us, he said: Tariq narrated to us that he memorized from Qays ibn Abi Hazim the *takbir* (saying *Allahu Akbar*) of the days of Tashriq: when he prayed the *Asr* (afternoon) prayer, he would say *takbir* after it.