And they shall keep the way of the Lord - The true religion; God's way; that in which God walks himself, and in which, of course, his followers walk also; to do justice and judgment; not only to preserve the truth in their creed, but maintain it in their practice.

For I know him,.... Not only by his omniscience, but with a special knowledge, such as is accompanied with peculiar love and affection; and so Jarchi says, it is expressive of love. God loved Abraham, he was a peculiar favourite of his, and therefore he would reveal his secrets to him, see Amos 3:2; and he knew not only who he was, but what he was, a holy good man, made so by his own grace, and what he would do by the assistance of that grace, and particularly what follows:

that he will command his children, and his household after him; to serve and worship the Lord: not his own children only, but his servants also, all in his family; lay his injunctions on them, use his authority with them, give them all needful instructions, and take such methods with them as would tend to propagate and preserve the true religion after his death:

and they shall keep the way of the Lord; which he has prescribed to men, and directed them to walk in, even everything respecting instituted worship then revealed, and particularly:

to do justice and judgment; to attend to all the laws, statutes, and judgments of God; to do that which is just and right between man and man; not as a justifying righteousness, by which Abraham himself was not justified before God; but to show their regard to the will of God, in gratitude for favours received from him, and to glorify him, as well as for the good of their fellow creatures:

that the Lord may bring upon Abraham that which he hath spoken of him: not only on Abraham personally, but upon his posterity, they walking in the ways of the Lord, according to his command and direction: the word "that" here rather signifies, as Vatablus rightly observes, the consequence than the cause, what would follow upon these things, rather than as procured by them; these being the way in which God designed to bestow them, though not for them.

For I know him, {i} that he will command his children and his household after him, and they shall keep the way of the LORD, to do justice and judgment; that the LORD may bring upon Abraham that which he hath spoken of him.

(i) He shows that fathers ought both to know God's judgments, and to declare them to their children.

18:19 I know Abraham that he will command his children, and his household after him - This is a bright part of Abraham's character. He not only prayed with his family, but he taught them, as a man of knowledge; nay, he commanded them as a man in authority, and was prophet and king, as well as priest, in his own house. And he not only took care of his children, but of his household: his servants were catechized servants. Masters of families should instruct, and inspect the manners of all under their roof. And this is given as the reason why God would make known to him his purpose concerning Sodom; because he was communicative of his knowledge, and improved it for the benefit of those that were under his charge.

18:16-22 The two who are supposed to have been created angels went toward Sodom. The one who is called Jehovah throughout the chapter, continued with Abraham, and would not hide from him the thing he intended to do. Though God long forbears with sinners, from which they fancy that the Lord does not see, and does not regard; yet when the day of his wrath comes, he will look toward them. The Lord will give Abraham an opportunity to intercede with him, and shows him the reason of his conduct. Consider, as a very bright part of Abraham's character and example, that he not only prayed with his family, but he was very careful to teach and rule them well. Those who expect family blessings must make conscience of family duty. Abraham did not fill their heads with matters of doubtful dispute; but he taught them to be serious and devout in the worship of God, and to be honest in their dealings with all men. Of how few may such a character be given in our days! How little care is taken by masters of families to ground those under them in the principles of religion! Do we watch from sabbath to sabbath whether they go forward or backward?