Musannaf Ibn Abi Shayba 3:2111

4488. Abd al-Salam ibn Harb narrated to us, from Yazid al-Dalani, from Abd al-Rahman ibn al-Aswad, from his father and Alqama, that they used to raise their heads from prostration until their buttocks were raised, and they would sit, and they would not perform the two prostrations of forgetfulness.