Hebrews 3:13
but exhort one another day by day, so long as it is called “today”, lest any one of you be hardened by the deceitfulness of sin.
World English Bible (Public Domain)
In context
Before · Hebrews 3:11–12
11As I swore in my wrath, ‘They will not enter into my rest.’” 12Beware, brothers, lest perhaps there might be in any one of you an evil heart of unbelief, in falling away from the living God;
13but exhort one another day by day, so long as it is called “today”, lest any one of you be hardened by the deceitfulness of sin.