ISB ~ Hebrews 3 v14

firm to the end:The Letter to the Hebrews is adamant that even true believers can forfeit their salvation by forsaking the Lord (6:4-8; 10:26-31; 12:14-17). This warning applies to genuine Christian “brethren”, who can “fall away” from God if they allow their hearts to become “evil” and “unbelieving” (3:12).