Muhammad ibn al-Muthanna and Ibn Bashshar narrated to us, both saying: Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, he said: I heard Qatadah narrating from Anas ibn Malik, who said: The Messenger of Allah, peace and blessings be upon him, said: "Straighten your rows, for the straightening of the row is part of the perfection of the prayer."