Hebrews 2:1; Hebrews 4:1; Hebrews 9:17

Hebrews 2:1

1 We must pay the most careful attention, therefore, to what we have heard, so that we do not drift away.

Hebrews 4:1

1 Therefore, since the promise of entering his rest still stands, let us be careful that none of you be found to have fallen short of it.

Hebrews 9:17

17 because a will is in force only when somebody has died; it never takes effect while the one who made it is living.