Sa‘d b. Abu Waqqas and Abu Bakra reported God’s Messenger as saying, "If anyone knowingly claims as father one who is not his father, paradise is forbidden to him.”
One day God's Messenger visited me looking pleased and asked if I was not surprised to hear that Mujazziz al-Mudlijl1 had entered, and seeing Usama and Zaid2 with a rug over them covering their heads and letting their feet appear, said, “These feet are related.”
(Bukhari and Muslim.)
1. Members of the tribe of Mudlij were said to have a reputation for being able to trace relationship from physical features.
2. Usama was Zaid's son.
‘A’isha said that ‘Utba b. Abu Waqqas enjoined his brother Sa'd b. Abu Waqqas that the son of Zam'a's slave girl was his, and told him to look after him. In the year of the Conquest Sa'd took him, saying he was his brother’s son, but ‘Abd b. Zam'a claimed him as his brother. They made a simultaneous plea to God’s Messenger, Sa‘d saying, “Messenger of God, my brother has enjoined me regarding him,” and ‘Abd b. Zam'a saying, "He is my brother and the son of my father's slave girl, being born on his bed.” God’s Messenger then said, "He belongs to you, ‘Abd b. Zam'a, for the child is attributed to the one on whose bed it is born, and the fornicator is deprived of any right.”1 He then told Sauda daughter of Zam'a to veil herself from him because of the resemblance to ‘Utba which he saw in him, and he did not see her till he went into God’s presence.2 In a version he said, “He is your brother, ‘Abd b. Zam'a because he was born on his father’s bed.”3
1. Al-hajar. This might alternatively mean that the fornicator is to be stoned.
2. i.e., until he died.
3. This explanatory addition does not occur in Masabih as-sunna.