The temptation to lie (vv. 7-11). Isaac could flee from famine, but when he put himself into a situation that offered no escape, he had to turn to deception to protect himself. Abraham committed this same sin twice, once in Egypt (Gen. 12:14-20) and once in Philistia (chap. 20). Remember, faith is living without scheming, and telling lies seems to be one of humanity’s favorite ways to escape responsibility.

Isaac was asked about the woman who was with him and, like his father Abraham before him, he said she was his sister. But when Abimelech saw Isaac caressing Rebekah, he knew she was his wife. Why did Isaac lie? Because he was afraid his pagan host would kill him in order to obtain his beautiful wife. His lie was evidence of his unbelief, for if he had claimed the covenant promise when he prayed for children (25:21), why couldn’t he claim that same covenant promise to protect himself and his wife?

The English poet John Dryden wrote, “Truth is the foundation of all knowledge and the cement of all societies.” When people don’t keep their word, the foundations of society begin to shake and things start to fall apart. Happy homes, lasting friendships, thriving businesses, stable governments, and effective churches all depend on truth for their success. The American preacher Phillips Brooks said, “Truth is always strong, no matter how weak it looks; and falsehood is always weak, no matter how strong it looks.” Truth is cement; falsehood is whitewash.

When he found himself in difficulty, Isaac was tempted to run and to lie, and we face these same temptations today. Isaac succumbed to temptation and was found out. It’s a sad day when unconverted people like Abimelech publicly expose God’s servants for telling lies. What an embarrassment to the cause of truth!