Al-Muwatta de Malik, 375

Nafé a rapporté que Omar Ibn Al-Khattab ordonnait d'égaliser les rangs. Une fois, renseigné, que les rangs sont égalisés, il faisait le takbir (signe du commencement de la prière)

Yahya related to me from Malik from Nafi that Umar ibn al-Khattab used to order the rows to be straightened, and when they had come to him and told him that the rows were straight he would say the takbir