Musannaf Ibn Abi Shaybah

Hazrat Mus'ab bin Sa'd says that when my father used to pray in the mosque, he would keep the bowing (ruku) and prostration (sajda) short and perform a light prayer, but when he prayed at home, he would prolong the prayer and the bowing and prostration. I asked him about this, and he replied, "We are those imams who are followed (in prayer)."