Commentaries:
Jamieson, Fausset, and Brown
one another—Greek, "yourselves"; let each exhort himself and his neighbor.
daily—Greek, "on each day," or "day by day."
while it is called To-day—while the "to-day" lasts (the day of grace, Luke 4:21, before the coming of the day of glory and judgment at Christ's coming, Hebrews 10:25, Hebrews 10:37). To-morrow is the day when idle men work, and fools repent. To-morrow is Satan's to-day; he cares not what good resolutions you form, if only you fix them for to-morrow.
lest . . . of you—The "you" is emphatic, as distinguished from "your fathers" (Hebrews 3:9). "That from among you no one (so the Greek order is in some of the oldest manuscripts) be hardened" (Hebrews 3:8).
deceitfulness—causing you to "err in your heart."
sin—unbelief.
Other Jamieson, Fausset, and Brown entries containing Hebrews 3:13:
Isaiah 55:6
Malachi 3:16
Matthew 10:22
Romans 9:18
Hebrews 3:15
Hebrews 4:3
Hebrews 10:25
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