Waki' bin al-Jarrah وكيع بن الجراح · Chapters on Shares of Inheritance

“A man died at the time of the Messenger of Allah (ﷺ), and he left no heir except for a slave whom he had set free. The Messenger of Allah (ﷺ) gave the legacy to him.”

“It is disbelief for a man to attribute himself to someone other than his father knowingly, or to deny his connection to his father, even subtly.”*

The Messenger of Allah (ﷺ) forbade selling the right of inheritance, or giving it as a gift.