Genesis 46:33

When Pharaoh shall call you. One of the first things Joseph purposed to do, after welcoming his relatives to Egypt, was to introduce his father and brothers to the king. Pharaoh might have intended to appoint some of them as officers, thinking they might be as useful to him as Joseph. But Joseph, well aware of the allurements of Egyptian court life, and the weak characters of his brothers, feared that they might soon succumb to temptation and lose the vision of their future part in God’s plan. This is why Joseph emphasized that they should state, if asked, that their occupation was that of shepherds, so implying that they were unqualified for court life.