The tradition mentioned above has also been transmitted by Sahl bin Saad through a different chain of narrators. This version has “She was pregnant, he denied pregnancy from him. So her son was attributed to her. In the law of succession the practice (sunnah) was established that the son gets a share in the inheritance of his mother and the mother gets the share in the inheritance of her son according to the shares prescribed by Allaah the Exalted.
Explanation & Benefits
Shaykh Umar Farooq Saeedi
Benefits and Issues:
It is understood that if a man denies his wife's pregnancy, the judge should have them perform li'an (mutual cursing), and the child will be attributed to the mother.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 2252