My ears heard it end my heart remembered it from Muhammad (May peace be upon him) who said: if a man claims to be the son of a man who is not his father, paradise will be forbidden for him. He said: I then met Abu Bakrah and mentioned it to him. He said: my ears heard it and my heart remembered it from Muhammad (peace be upon him). ‘Asim said : I said : Abu ‘Uthman! Two men testified before you. Who are they? He said : One of them is the one who is first to shoot arrow in the path of Allah or in the path of Islam, that is to say : Sa’d b. Malik. The other is the one came from al-Taif with ten and some men on foot. He then mentioned his excellence. Abu Dawud said : When al-Nufaili mentioned this tradition, he said : I swear by Allah, this is sweater with me than honey, that is no say, his way transmission. Abu ‘Ali said : I heard Abu Dawud say : I heard Ahmad say : The people of Kufah have no light in their traditions. I did not see them like the people of Basrah. They learnt it from Shu’bah.
if a man becomes the client of any people without the permission of his patrons (i.e. those who have freed him), on him will be the curse of Allah, of angels and of all people; no obligatory or supererogatory worship will be accepted from him.
If anyone pretends to be the son of a man other than his father, or attributes his freedom to people other than those who set him free, on him will be the curse of Allah that will continue till the day of resurrection.
The Prophet (ﷺ) said: Allah, Most High, has removed from you the pride of the pre-Islamic period and its boasting in ancestors. One is only a pious believer or a miserable sinner. You are sons of Adam, and Adam came from dust. Let the people cease to boast about their ancestors. They are merely fuel in Jahannam; or they will certainly be of less account with Allah than the beetle which rolls dung with its nose.
The Messenger of Allah (ﷺ) gave us an address and said: The best of you is the one who defends his tribe, so long as he commits no sin. Abu Dawud said: Abu Ayyub b. Suwaid is weak.