Ubaydullah bin Abi Yazid narrates from his father that Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) sent for an elderly man of Banu Zuhrah who used to live in our house. I took him to Sayyiduna Umar bin al-Khattab (may Allah be pleased with him), and he asked him about a birth from among the births of the Jahiliyyah (pre-Islamic era). He said: As for the bed, it belongs to so-and-so, and as for the sperm, it belongs to so-and-so. Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) said: You have spoken the truth, but the Messenger of Allah (peace and blessings be upon him) gave judgment "in favour of the bed."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب اللعان / 15330