He was also asked:

About a man who married his own daughter born of illicit intercourse.

He replied:

According to the majority of Muslim imams, he may not marry her. Indeed, Imam Ahmad denied that there had been any disagreement among the early generations on this matter. He said: “Whoever does this is to be put to death.” When told that Mālik had permitted it, he rejected that attribution to Mālik as false.

Its prohibition is the position of Abū Hanīfa and his followers, Ahmad and his followers, Mālik and the majority of his followers, and many of al-Shāfiʿī’s followers. He also denied that al-Shāfiʿī had explicitly stated otherwise. They said: “His explicit statement concerned his daughter through suckling, not the woman with whom he had committed illicit intercourse.” Allah knows best.

He—may Allah have mercy on him—was also asked:

About a man who committed illicit intercourse with a woman and then died: may that man’s son marry her or not?

He replied:

Marrying her is forbidden according to the schools of Abū Hanīfa and Ahmad, and according to one of the two positions in Mālik’s school. The other position permits it, which is also the position of al-Shāfiʿī’s school.