Hebrews 3:12-14

Take heed, brethren, lest haply there shall be in any one of you an evil heart of unbelief, in falling away from the living God: but exhort one another day by day, so long as it is called To-day; lest any one of you be hardened by the deceitfulness of sin: for we are become partakers of Christ, if we hold fast the beginning of our confidence firm unto the end