Leviticus 19:11

We are taught here, I. To be honest and true in all our dealings, Lev 19:11. God, who has appointed every man's property by his providence, forbids by his law the invading of that appointment, either by downright theft, You shall not steal, or by fraudulent dealing, "You shall not cheat, or deal falsely." Whatever we have in the world, we must see to it that it be honestly come by, for we cannot be truly rich, nor long rich, with that which is not. The God of truth, who requires truth in the heart (Psa 51:6), requires it also in the tongue: Neither lie one to another, either in bargaining or common converse. This is one of the laws of Christianity (Col 3:9): Lie not one to another. Those that do not speak truth do not deserve to be told truth; those that sin by lying justly suffer by it; therefore we are forbidden to lie one to another; for, if we lie to others, we teach them to lie to us. II. To maintain a very reverent regard to the sacred name of God (Lev 19:12), and not to call him to be witness either, 1. To a lie: You shall not swear falsely. It is bad to tell a lie, but it is much worse to swear it. Or, 2.

— Matthew Henry's Concise Commentary (public domain)

Ye shall not steal--A variety of social duties are inculcated in this passage, chiefly in reference to common and little-thought-of vices to which mankind are exceedingly prone; such as committing petty frauds, or not scrupling to violate truth in transactions of business, ridiculing bodily infirmities, or circulating stories to the prejudice of others. In opposition to these bad habits, a spirit of humanity and brotherly kindness is strongly enforced.

— Jamieson-Fausset-Brown Commentary (public domain)