Multiplication of wives would lead to sensuality, and so to an apostasy no less fatal in effect than downright idolatry (compare Exodus 34:16). This rule, like the others, abridges to the ruler of Israel liberties usually enjoyed without stint by the kings of the East. The restriction was in the days of Moses unprecedented; and demanded a higher standard in the king of Israel than was looked for among his equals in other nations.
Neither shall he greatly multiply to himself silver and gold - In this third prohibition, as in the other two, excess is forbidden. Vast accumulation of treasure could hardly be effected without oppression; nor when effected fail to produce pride and a “trust in uncertain riches” 1 Timothy 6:17.