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Hebrews 3:13
But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin. (Hebrews 3:13)
Deceitfulness.
 Or, “delusion,” “fraud.” Men are lured into sin because it appears attractive and desirable. It was when Eve “saw” that what God had warned her not to eat appeared “good,” “pleasant,” and desirable (see on Gen. 3:6) that she stepped across the line that separates righteousness from sin. The sincere Christian will do well to beware when anything that God has warned against begins to appear attractive and desirable. When what God has said is all wrong begins to look all right the Christian may know that he stands on Satan’s enchanted ground, where things appear to be the opposite of what they really are.
Hardened.
 See on Ex. 4:21; cf. Heb. 3:8.
While it is called To day.
That is, while the day of probation lasts and while the merciful invitation to enter into God’s “rest” is still being made.
Exhort one another daily.
 Or, “keep on exhorting [or, “encouraging”] one another day by day.” Compare on Acts 16:15; 1 Cor. 1:10.