Genesis 42:6, 23, 27

Since Joseph was governor of all Egypt and in charge of selling grain to all the people, it was to him that his brothers came. When they arrived, they bowed before him with their faces to the ground.

Of course, they didn’t know that Joseph understood them, for he had been speaking to them through an interpreter.

But when they stopped for the night and one of them opened his sack to get grain for his donkey, he found his money in the top of his sack.