Musnad al-Humaydi

Ubaydullah bin Abu Yazid narrates: My father told me that once Sayyiduna Umar bin Khattab (may Allah be pleased with him) sent a message to an elder from Banu Zuhrah and called him; he used to live in our neighborhood and had witnessed the era of ignorance. I went with that elder to Sayyiduna Umar bin Khattab (may Allah be pleased with him). Sayyiduna Umar bin Khattab (may Allah be pleased with him) was present in the Hatim at that time. Sayyiduna Umar bin Khattab (may Allah be pleased with him) asked him about (illegitimate children) born in the era of ignorance. The elder replied: As far as the sperm is concerned, it belonged to such-and-such person, and as for the birth, it happened on the bed of such-and-such person. So Sayyiduna Umar bin Khattab (may Allah be pleased with him) said: You have spoken the truth, but the Noble Prophet (peace and blessings be upon him) has given the decision in favor of the bed (i.e., the child belongs to the owner of the bed). When that elderly person turned back, Sayyiduna Umar bin Khattab (may Allah be pleased with him) called him and asked: Tell me about the construction of the Ka'bah? He replied: The Quraysh wanted to earn virtue by constructing the Ka'bah, but they were unable to complete it; their (resources) became scarce, so they left out a part of the Hatim area. So Sayyiduna Umar bin Khattab (may Allah be pleased with him) said: You have spoken the truth.