Musannaf Ibn Abi Shaybah 34928 — What they said on a man who accepts

Ibn Abi Mulaykah (may Allah have mercy on him) said that Sayyiduna Umar (may Allah be pleased with him) said: "By the One in whose hand is my soul, if Sayyiduna Abu Bakr (may Allah be pleased with him) had obeyed us, we would have disbelieved in a single morning." For when the people asked him to reduce the zakah, he refused their request and said: "If they withhold from me even a camel's tether, I will certainly wage jihad against them."