Who placed Israel's sins on the scapegoat on the Day of Atonement?
The High Priest alone performed this act. Only he could enter behind the veil, sprinkle the blood on the mercy seat, and lay his hands on the scapegoat. By that symbolic act, he placed all the sins of Israel upon the scapegoat, which was the Day of Atonement ritual.
Les teaches that only one man in Israel could do this: the High Priest. He alone could go in behind the veil and sprinkle the blood on the mercy seat. He alone could lay his hands on that scapegoat and symbolically place all the sins of Israel upon it. Les emphasizes that this was exclusively the work of the High Priest, not any other man in Israel.