Al-Kāfi

2. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn Sayf from Muhammad ibn af-Hassan al-Ash ‘ariy who has narrated the following: “Once certain persons of our people with me wrote to abu Ja’far, al-Thaniy (a.s.), asking about a man who commits the indecent act with a woman, then marries her after she becomes pregnant and gives birth to a child who of all creatures is similar to him. He (the Imam) wrote back in his handwriting the answer that said, ‘A child born out of wedlock cannot be made to inherit.’”