Leviticus 19:13

Not defraud thy neighbour. More exactly, “oppress thy neighbor.” Verse 11 forbids injuries by craftiness; this, by violence or superior power. Some conclude that because a thing is legal, it is therefore permissible to the Christian. A thing may be lawful, yet far from expedient (1 Cor. 6:12; 10:23). Also, the law of the land may call lawful certain courses of conduct that God frowns upon. God does not countenance legal loopholes.

The wages. Wages are to be paid promptly, as are debts when they fall due. To withhold wages agreed upon, or the payment of just debts, or to delay these unduly, is displeasing to God and is dishonest (Deut. 24:14, 15). Strict honesty requires that a person enter into no arrangements or accept no obligations unless he has every reason to believe that he can discharge his responsibilities with respect to them. Furthermore, to allow a stipulated time for settlement of an obligation to pass without making satisfactory arrangements is dishonesty of the worst sort, and marks a man as irresponsible and untrustworthy.