Hebrews 5:14

5:14 But solid food is for the mature, whose perceptions are trained by practice to discern both good and evil.

Hebrews 6:12

6:12 so that you may not be sluggish, but imitators of those who through faith and perseverance inherit the promises.

Hebrews 7:8

7:8 and in one case tithes are received by mortal men, while in the other by him who is affirmed to be alive.

tn Or “dull.”