Musannaf Ibn Abi Shaybah 23413 — Consuming usury and what is reported

Sayyiduna Abdullah bin Yazid al-Ansari (may Allah be pleased with him) gave four thousand dirhams to a slave of his and sent him off. He went to Isfahan and traded until he had twenty thousand dirhams. Then the slave died. Sayyiduna Abdullah (may Allah be pleased with him) was told that the slave used to mix usury (riba) into his trade, so he took back only four thousand and left the rest of the money, not taking it.