Deuteronomy 17:16-17

Matthew(i) 16 But in any wyse let hym not holde to many horses, that he bringe not the people agayne to Egypt thorowe the multitude of horsses, for asmuch as the Lord hath sayd vnto you: ye shall henceforthe go no more agayne that way. 17 Also he shall not haue to many wyues lest his hert turne away, neither shal he gather hym siluer & gold to much.