Sayyiduna Tamim Dari (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) said: "Wudu becomes obligatory due to the flowing of every (type of) blood." The narrator of this narration, Umar bin Abdul Aziz, did not hear hadith from Tamim Dari nor did he meet him, while two narrators of this narration, Yazid bin Khalid and Yazid bin Muhammad, are both unknown.