Hebrews 3:6

3:6 But Christ is faithful as a son over God’s house. We are of his house, if in fact we hold firmly to our confidence and the hope we take pride in.

Hebrews 6:18

6:18 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.