The Son That is the Result of Fornication

Question :

I heard that this is a Hadith:
"Indeed, Paradise is forbidden upon the son that is the result of fornication." Is this an authentic Hadith? And if it is authentic, what is the sin of this child, who has to bear the sins of his parents?

Answer:

In a Hadith related by Abu Hurairah, may Allah be pleased with him, the Prophet ﷺ said :
"The son that is the result of fornication is the worst of the three."

Some scholars say that it means that the child is the worst of the three the father, the mother, and him worst in his origin, in his descent, in his lineage, and in his birth. This is because he was created from the "water" of the male and female fornicator, a "water" that is vile. Moreover, his descent is evil, for one never knows he may become affected by that vile origin, making him do evil. In this context, i.e., one's origin, Allah Almighty says, absolving Maryam of any evil:
"Your father was not a man who used to commit adultery, nor your mother was an unchaste woman'"

But at the same time, the illegitimate child is not held. accountable for the sin of his parents:
"And no bearer of burdens shall bear the burden of another"

The sin of fornication and its punishment for both this world and the Hereafter are limited to the parents, but at the same time their evil might affect their child, making him take the path of evil as well. At the same time, however, this is not in all cases, for Allâh Almighty may make him righteous, making him a scholar or a pious Muslim, making him the better of the three. And Allâh Almighty knows best.

Source:
Ibn Jibreen
Fatawa Islamiyah, Vol. 7 Pages 205-206