It is narrated from Sa'id bin al-Musayyib that Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) came to Sayyida Aisha (may Allah be pleased with her) and said to her: "I have been greatly troubled by the disagreement of the Companions of the Messenger of Allah (peace and blessings be upon him) regarding an issue. I am ashamed to mention it before you." So Sayyida Aisha (may Allah be pleased with her) said: "What is that issue which you would ask your mother about? Ask me." Sayyiduna Abu Musa (may Allah be pleased with him) said: "If a man has intercourse with his wife, then enters (her) but does not ejaculate, what is the ruling?" Sayyida Aisha (may Allah be pleased with her) said: "When the circumcised part passes the circumcised part, ghusl becomes obligatory." Sayyiduna Abu Musa (may Allah be pleased with him) said: "Now I will not ask anyone about this issue after you."