'Pledge' in the Bible

The Spirit is the guarantee [the first installment, the pledge, a foretaste] of our inheritance until the redemption of God’s own [purchased] possession [His believers], to the praise of His glory.

and so they incur condemnation for having set aside their previous pledge.

And so, having patiently waited, he realized the promise [in the miraculous birth of Isaac, as a pledge of what was to come from God].