The Prophet (peace and blessings be upon him) said: "If people were given (what they ask) merely on the basis of their claims, some people would claim the blood and the wealth of others; but the oath is upon the one against whom the claim is made."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / Q18335
Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said that Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) would not make anyone an heir of a captive (hamil). (That is, a captive who is moved from place to place.)
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18335
Imam al-Sha'bi (may Allah have mercy on him) said that Sayyiduna Umar (may Allah be pleased with him) wrote to Judge Shurayh (may Allah have mercy on him) that no one should be made an heir of a captive except through proof, even if the woman brought him wrapped in her cloth.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18336
Imam al-Sha'bi (may Allah have mercy on him) narrates from Judge Shurayh (may Allah have mercy on him) that he said: Sayyiduna Umar (may Allah be pleased with him) wrote to me: "Do not make anyone an heir of a captive without proof."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18337
Ibn Shihab al-Zuhri (may Allah have mercy on him) said that Sayyiduna Uthman bin Affan (may Allah be pleased with him) consulted the noble Companions (may Allah be pleased with them) about the captive. They spoke about it, and Sayyiduna Uthman (may Allah be pleased with him) said: We make someone an heir of Allah's wealth only through proofs.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18339
Habib bin Abi Thabit said that Sayyiduna Uthman (may Allah be pleased with him) used to say that the captive is to be made an heir only on the basis of proof.
These chains from Umar and Uthman (may Allah be pleased with them both) are all weak.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18340