Musannaf Ibn Abi Shaybah 10165 — Those who said: no zakah is due

Yahya bin Sa'id said: The news reached me that Salim bin Abdullah used to say: We have the written decree of Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) concerning the zakah of camels, and no one asked us about it until the time of Umar bin Abd al-Aziz came. So we sent that letter to him, and the letter that Umar bin Abd al-Aziz wrote when he sent them to collect zakah said: "There is no zakah on camels until they reach five."