Deuteronomy 17:16 in the King James Version
But he shall not multiply horses to himself, nor cause the people to return to Egypt, to the end that he should multiply horses: forasmuch as the LORD hath said unto you, Ye shall henceforth return no more that way.
Context
15 you shall surely set him whom the LORD your God chooses as king over yourselves. You shall set as king over you one from among your brothers. You may not put a foreigner over you, who is not your brother.
16 Only he shall not multiply horses to himself, nor cause the people to return to Egypt, to the end that he may multiply horses; because the LORD has said to you, “You shall not go back that way again.”
17 He shall not multiply wives to himself, that his heart not turn away. He shall not greatly multiply to himself silver and gold.