Matthew Henry on Prov. 11:1

Verse 1 As religion towards God is a branch of universal righteousness (he is not an honest man that is not devout), so righteousness towards men is a branch of true religion, for he is not a godly man that is not honest, nor can he expect that his devotion should be accepted; for, 1. Nothing is more offensive to God than deceit in commerce. A false balance is here put for all manner of unjust and fraudulent practices in dealing with any person, which are all an abomination to the Lord, and render those abominable to him that allow themselves in the use of such accursed arts of thriving. It is an affront to justice, which God is the patron of, as well as a wrong to our neighbour, whom God is the protector of. Men make light of such frauds, and think there is no sin in that which there is money to be got by, and, while it passes undiscovered, they cannot blame themselves for it; a blot is no blot till it is hit, Hos. 12:7, 8. But they are not the less an abomination to God, who will be the avenger of those that are defrauded by their brethren. 2. Nothing is more pleasing to God than fair and honest dealing, nor more necessary to make us and our devotions acceptable to him: A just weight is his delight. He himself goes by a just weight, and holds the scale of judgment with an even hand, and therefore is pleased with those that are herein followers of him. A balance cheats, under pretence of doing right most exactly, and therefore is the greater abomination to God.