18:4Al-Kahf

The Prophet (ﷺ) said, "If somebody claims to be the son of any other than his real father knowingly, he but disbelieves in Allah, and if somebody claims to belong to some folk to whom he does not belong, let such a person take his place in the (Hell) Fire."

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 said: 'The son of Adam tells a lie against Me,, though he hasn't the right to do so. He abuses me though he hasn't the right to do so. As for his telling a lie against Me, it is his saying that I will not recreate him as I created him for the first time. In fact, the first creation was not easier for Me than new creation. As for his abusing Me, it is his saying that Allah has begotten children, while I am the One, the Self-Sufficient Master Whom all creatures need, I beget not, nor was I begotten, and there is none like unto Me."

I heard the Prophet (ﷺ) saying, "Whoever claims to be the son of a person other than his father, and he knows that person is not his father, then Paradise will be forbidden for him." I mentioned that to Abu Bakra, and he said, "My ears heard that and my heart memorized it from Allah's Messenger (ﷺ).

“Then the Verse of Li’an was revealed, the Messenger of Allah (ﷺ) said: ‘Any woman who attributed her child to people to whom he does not belong, then she has no relation to (the religion of) Allah, and she will never enter Paradise, and any man who rejects his child, while he recognizes him, Allah will screen Himself from him on the Day of Resurrection and disgrace him before the witnesses.’”