Here, I. God tried Isaac by his providence. Isaac had been trained up in a believing dependence upon the divine grant of the land of Canaan to him and his heirs; yet now there is a famine in the land, Gen 26:1. What shall he think of the promise when the promised land will not find him bread? Is such a grant worth accepting, upon such terms, and after so long a time? Yes, Isaac will still cleave to the covenant; and the less valuable Canaan in itself seems to be the better he is taught to value it, 1. As a token of God's everlasting kindness to him; and, 2. As a type of heaven's everlasting blessedness. Note, The intrinsic worth of God's promises cannot be lessened in a believer's eye by any cross providences. II. He directed him under this trial by his word. Isaac finds himself straitened by the scarcity of provisions. Somewhere he must go for supply; it should seem, he set out for Egypt, whither his father went in the like strait, but he takes Gerar in his way, full of thoughts, no doubt, which way he had best steer his course, till God graciously appeared to him, and determined him, abundantly to his satisfaction. 1. God bade him stay where he was, and not go down into Egypt: Sojourn in this land, Gen 26:2, Gen 26:3. There was a famine in Jacob's days, and God bade him go down into Egypt (Gen 46:3, Gen 46:4), a famine in Isaac's days, and God bade him not to go down, a famine in Abraham's days, and God left him to his liberty, directing him neither way. This variety in the divine procedure (considering that Egypt was always a place of trial and exercise to God's people) some ground upon the different characters of these three patriarchs. Abraham was a man of very high attainments, and intimate communion with God; and to him all places and conditions were alike. Isaac was a very good man, but not cut out for hardship; therefore he is forbidden to go to Egypt. Jacob was inured to difficulties, strong and patient; and therefore he must go down into Egypt, that the trial of his faith might be to praise, and honour, and glory. Thus God proportions his people's trials to their strength. 2. He promised to be with him, and bless him, Gen 26:3. As we may go any where with comfort when God's blessing goes with us, so we may stay any where contentedly if that blessing rest upon us. 3. He renewed the covenant with him, which had so often been made with Abraham, repeating and ratifying the promises of the land of Canaan, a numerous issue, and the Messiah, Gen 26:3, Gen 26:4. Note, Those that must live by faith have need often to review, and repeat to themselves, the promises they are to live upon, especially when they are called to any instance of suffering or self-denial. 4. He recommended to him the good example of his father's obedience, as that which had preserved the entail of the covenant in his family (Gen 26:5): "Abraham obeyed my voice; do thou do so too, and the promise shall be sure to thee." Abraham's obedience is here celebrated, to his honour; for by it he obtained a good report both with God and men. A great variety of words is here used to express the divine will, to which Abraham was obedient (my voice, my charge, my commandments, my statutes, and my laws), which may intimate that Abraham's obedience was universal; he obeyed the original laws of nature, the revealed laws of divine worship, particularly that of circumcision, and all the extraordinary precepts God gave him, as that of quitting his country, and that (which some think is more especially referred to) of the offering up of his son, which Isaac himself had reason enough to remember. Note, Those only shall have the benefit and comfort of God's covenant with their godly parents that tread in the steps of their obedience.

Isaac had now laid aside all thoughts of going to Egypt, and, in obedience to the heavenly vision, sets up his staff in Gerar, the country in which he was born (Gen 26:6), yet there he enters into temptation, the same temptation that his good father had been once and again surprised and overcome by, namely, to deny his wife, and to give out that she was his sister. Observe, I. How he sinned, Gen 26:7. Because his wife was handsome, he fancied the Philistines would find some way or other to take him off, that some of them might marry her; and therefore she must pass for his sister. It is an unaccountable thing that both these great and good men should be guilty of so strange a piece of dissimulation, by which they so much exposed both their own and their wives' reputation. But we see, 1. That very good men have sometimes been guilty of very great faults and follies. Let those therefore that stand take heed lest they fall, and those that have fallen not despair of being helped up again. 2. That there is an aptness in us to imitate even the weaknesses and infirmities of those we have a value for. We have need therefore to keep our foot, lest, while we aim to tread in the steps of good men, we sometimes tread in their by-steps. II. How he was detected, and the cheat discovered, by the king himself. Abimelech (not the same that was in Abraham's days, ch. 20, for this was nearly 100 years after that, but this was the common name of the Philistine kings, as Caesar of the Roman emperors) saw Isaac more familiar and pleasant with Rebekah than he knew he would be with his sister (Gen 26:8): he saw him sporting with her, or laughing; it is the same word with that from which Isaac has his name. He was rejoicing with the wife of his youth, Pro 5:18. It becomes those in that relation to be pleasant with one another, as those that are pleased with one another. Nowhere may a man more allow himself to be innocently merry than with his own wife and children. Abimelech charged him with the fraud (Gen 26:9), showed him how frivolous his excuse was and what might have been the bad consequences of it (Gen 26:10), and then, to convince him how groundless and unjust his jealousy of them was, took him and his family under his particular protection, forbidding any injury to be done to him or his wife upon pain of death, Gen 26:11. Note, 1. A lying tongue is but for a moment. Truth is the daughter of time; and, in time, it will out. 2. One sin is often the inlet to many, and therefore the beginnings of sin ought to be avoided. 3. The sins of professors shame them before those that are without. 4. God can make those that are incensed against his people, though there may be some colour of cause for it, to know that it is at their peril if they do them any hurt. See Psa 105:14, Psa 105:15.