Genesis 18:19 - Matthew Poole's English Annotations on the Holy Bible

For I know him; I know him to be such a one as I am now describing; or I know this concerning him which now follows. Others, I love him, and therefore cannot conceal this from him. Words of knowledge being oft put for love, as Jeremiah 1:5, Jeremiah 24:5 Hosea 13:5 Amos 3:2. That he will command, or instruct, as the word is used, Leviticus 14:5 Deuteronomy 20:18, Deuteronomy 27:4. It will not be in vain that I tell him this, and give him occasion to pray and to taste my goodness in answering prayers, because he will not smother these things in his own breast, but manifest them to others, and teach them how good God is, who so readily complies with the desires and prayers of men, and how terrible he is to incorrigible sinners, and how evil and bitter a thing it is to sin against God. And so I shall get the end I aim at in all my works, which is, that they may be known for the good of others; that they may learn by such examples. His children and his household, who will live when he is dead. He will so diligently imprint these things in their minds, that they shall never forget them. They shall keep the way of the Lord, i.e. observe and walk in the way of God's precepts: q.d. He shall not lose his design or labour; for what he teacheth they shall learn and practise. See Psalms 51:15, &c. To do justice and judgement, i.e. to do all things that are good, and right, and just, both to God and men: compare Psalms 119:121. That Abraham and his posterity, keeping the conditions of the covenant required on their part, God may without any blemish to his honour or justice give all those good things which he hath promised to them.