Ishaq bin Mansur al-Kausaj إسحاق بن منصور بن بهرام - الكوسج · The Book of al-Bay'ah

"I came to the Messenger of Allah with my father Umayyah on the Day of the Conquest (of Makkah) and said: 'O Messenger of Allah, accept my father's pledge for emigration (Al-Hijrah).' The Messenger of Allah said: 'I will accept his pledge to fight in Jihad, for the emigration (Al-Hijrah) has ceased."'

"Religion is sincerity, religion is sincerity (Al-Nasihah), religion is sincerity." They said; "To whom, O Messenger of Allah?" He said: "To Allah, to His Book, to His Messenger, to the imams of the Muslims and to their common folk."