While it is called To-day;— That is, "As long as you can use this expression;—every day.—Exhort and encourage one another every day, to a steady perseverance in duty; and do this as often as the day comes, lest any of you grow careless, &c." Dr. Doddridge explains it, "While you are under this dispensation of grace." Perhaps the meaning only may be, "While you have it in your power; while your life is spared;—for the night cometh, when no man can work."
Related Commentaries of Hebrews 3:13
Hebrews 3:13
13 But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin.