‘Umar b. ‘Abd al-‘Aziz told on the authority of Tamim ad-Dari that God’s messenger said, “Ablution must be performed on account of any flow of blood.”
Daraqutni transmitted the two traditions, saying that ‘Umar b. ‘Abd al-‘Aziz neither heard from Tamim ad-Dari nor saw him, and that Yazid b. Khalid and Yazid b. Muhammad* are unknown.
*These men occur in the isnad.