Musannaf Ibn Abi Shaybah 10097 — Withholding zakah

Muthanna bin Sa'id said: I heard Sayyiduna Anas (may Allah be pleased with him), when a group of Bedouins complained to him about the zakah, say: "Gather the zakah and pay it at its time; then whatever is taken from you after that is an injustice done to you."