'Fast' in the Bible

But Christ as a son over his own house; whose house are we, if we hold fast the confidence and the rejoicing of the hope firm unto the end.

for partakers we have become of the Christ, if the beginning of the confidence unto the end we may hold fast,

Seeing then that we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast our profession.

so that we who have found refuge in him may find strong encouragement to hold fast to the hope set before us through two unchangeable things, since it is impossible for God to lie.

Let us hold fast the profession of our faith without wavering; (for he is faithful that promised;)