'Bond servants' in the Bible

then you shall tell your son, "We were Pharaoh's bondservants in Egypt: and the LORD brought us out of Egypt with a mighty hand;

The LORD will bring you into Egypt again with ships, by the way of which I said to you, You shall see it no more again: and there you shall sell yourselves to your enemies for bondservants and for bondmaids, and no man shall buy you.