The Jews denied the lawfulness of some foods such as the milk of camel, and Qurän rejects their charges saying: ``At first all the foods were lawful for the children of Israel except a few of them that Israel forbade himself of serving, and that was before the law was sent down.''
According to the Islamic traditions, when Jacob ate meat or drank the milk of camel or some other particular food, they seemed not agreeble to his health. He therefore refrained from some food which found them not fit for his health. Then some of his followers followed him and abstained from eating or drinking those particular foods. Laters on a group of the Israelites were led to error and by the wrong impressions, they thought that such foods were made unlawful by the Mosaic Law!