Musannaf Ibn Abi Shaybah 25965 — Reports on what may be eaten

It is narrated from Sayyiduna Abu Barzah (may Allah be pleased with him); he said: We were on one of our military expeditions when we met some people of the polytheists. We drove them back from their hot ashes, went onto them, and began eating (prepared) food from them. We had heard in the Jahiliyyah that whoever eats (this) bread becomes fat. So when we ate these loaves, each one of us began looking at his own right and left sides to see whether he had become fat.