Sayyiduna Uqbah bin Amir (may Allah be pleased with him) narrates this statement of the Prophet (peace and blessings of Allah be upon him): "The condition most deserving to be fulfilled is that by which you make private parts lawful (i.e., the marriage contract)." (Imam Ibn Hibban, may Allah have mercy on him, says:) The narrator named Abu al-Khair is Marthad bin Abdullah Yazni.