Sayyiduna Sahl bin Sa'd al-Ansari (may Allah be pleased with him) says that Sayyiduna Uwaymir al-Ansari (may Allah be pleased with him) came to Sayyiduna Asim bin Adi (may Allah be pleased with him); he mentioned a hadith with the same meaning as the hadith of Imam Malik (may Allah have mercy on him). When they had finished the li'an, he said: "O Messenger of Allah (peace and blessings be upon him)! If I keep her as my wife, then I have lied against her." Then he pronounced three divorces before the Prophet (peace and blessings be upon him) had commanded him. The separation of the two later became the sunnah for those who perform li'an. Sayyiduna Sahl (may Allah be pleased with him) says: She was pregnant, and the son used to be attributed to his mother; then this practice became established that the mother inherits from the son and the son from the mother, according to the shares Allah has fixed for them.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب اللعان / 15320