And Ahmad ibn Hanbal narrated to me, saying: Muhammad ibn Ja'far narrated to us, saying: Shu'bah narrated to us, from Warqa', from 'Amr ibn Dinar, from 'Ata' ibn Yasar, from Abu Hurayrah, from the Prophet, peace and blessings be upon him, who said: "When the prayer has been established (the iqamah is called), then there is no prayer except the obligatory one."