פּירוש אויף בראשית 41:42

“He put a gold chain about his neck” [41:42]. He put a golden necklace around Joseph’s neck. He rode in the chariot right behind that of Pharaoh. They called out in all the streets, here rides the young king.

ויסר פרעה את טבעתו AND PHARAOH TOOK OFF HIS RING — When the king gives his ring it is a sign that the person to whom he hands it is to be second to him in rank.

ויתן אותה על יד יוסף, “he placed it on Joseph’s hand.” Pharaoh said to himself that maybe Joseph’s interpretation etc. was only designed to rid himself of Pharaoh’s supervision. This is why he entrusted him with executive power to observe whether he would work for the benefit of the state. If Joseph accepted this task, he would be convinced that he was loyal and upright, as he would know that failure would bring disastrous consequences for himself.