Hebrews 6:4; Hebrews 6:18; Hebrews 10:4; Hebrews 11:6

Hebrews 6:4

4 It is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit,

Hebrews 6:18

18 God did this so that, by two unchangeable things in which it is impossible for God to lie, we who have fled to take hold of the hope set before us may be greatly encouraged.

Hebrews 10:4

4 It is impossible for the blood of bulls and goats to take away sins.

Hebrews 11:6

6 And without faith it is impossible to please God, because anyone who comes to him must believe that he exists and that he rewards those who earnestly seek him.