'Back part' in the Bible

The throne had six steps, and the top of the throne was round in the back part. And there were stays on either side on the place of the seat, and two lions stood beside the stays;

And he kept back part of the price, his wife also knowing, and brought a certain part and laid it at the apostles' feet.

But Peter said, Ananias, why has Satan filled your heart for you to lie to the Holy Spirit, and to keep back part of the price of the land?