Ibn Ezra on Leviticus 4:15

זקני העדה. הם המנהיגים והם יסמכו את ידיהם בעדם ובעד כל ישראל כי לא יתכן שיסמכו כל ישראל: AND THE ELDERS OF THE CONGREGATION. The elders are the leaders. They will lay their hands²⁷On the head of the bullock. on their behalf and on behalf of all of Israel, for it is impossible for all of Israel to place their hands.²⁸On the head of the bullock.