מדרש אויף שמות 7:6

(Exod. 12:2:) THIS MONTH SHALL BE FOR YOU THE HEAD⁵⁶R’Sh. In the biblical context this word would normally be translated BEGINNING, but the midrash requires the translation HEAD. OF THE MONTHS; IT SHALL BE THE FIRST (R'ShWN) OF THE MONTHS OF THE YEAR FOR YOU. > The Holy One said to Israel: In this month you shall be redeemed.⁵⁷PRK 5:18; PR 15:25; Exod. R. 15:1. They said to him: You have said that we are being redeemed, but are we going to be enslaved another time? He said to them: Up to now you have had a HEAD (R'Sh) and a FIRST (R'ShWN). HEAD signifies the kingdom of Babylon.⁵⁸See below, 7:6. Thus it is stated (in Dan. 2:38): YOU ARE THE HEAD OF GOLD. This refers to Nebuchadnezzar. FIRST signifies Esau, as stated (in Gen. 25:25): THE FIRST (i.e., Esau) CAME FORTH RUDDY. These are the ones who are going to be enslaved by you.