'Pledge' in the Bible

So now, swear to me here by God [that] you will not deal with me falsely, or with my descendants, or my posterity. According to the kindness that I have done to you, you shall [pledge] to do with me and with the land where you have dwelled as an alien."

And he said, "I will send a kid from the goats of the flock." And she said, "[Only] if you give a pledge until you send [it]."

And he said, "What [is] the pledge that I must give to you?" And she said, "your seal, your cord, and your staff that [is] in your hand." And he gave [them] to her and went in to her. And she conceived by him.

And Judah sent the kid from the goats by the hand of his friend the Adullamite to take [back] the pledge from the hand of the woman, but he could not find her.