'Bond' in the Bible

"If your brother with you becomes so poor that he sells himself to you, you are not to make him serve like a bond slave.

You may give them as inherited property to your children after you, to own as properties in perpetuity. You may make bond slaves of them, but no one is to rule over his fellow Israeli with harshness.

"I'll cause you to pass under the rod until I will have brought you into the bond of the covenant.

but after they had gotten a bond from Jason and the others, they let them go.

Do your best to maintain the unity of the Spirit by means of the bond of peace.