It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that he said: I had a wife whom I loved, but Sayyiduna Umar (may Allah be pleased with him) disliked her. He said to me: "Divorce her," but I refused. Then he mentioned this to the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Obey your father and divorce her." So I divorced her. This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it. Al-Harith bin Abdur-Rahman al-Madani is the maternal uncle of Ibn Abi Dhi'b, and both Shaykhs used him as evidence!

It is narrated from Abu Abdur-Rahman al-Sulami that a man came to Sayyiduna Abu al-Darda' (may Allah be pleased with him) and said: "My mother kept after me until I married, and now she orders me to divorce her." He said: "I am not the one to order you to disobey your mother, nor do I order you to divorce your wife. However, if you wish, I will tell you the hadith I heard from the Messenger of Allah (peace and blessings be upon him); he (peace and blessings be upon him) used to say: 'The father (parents) is the middle gate of Paradise.' Now it is your choice whether to guard that gate or to lose it." This hadith is sahih (authentic) in its chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.