Neither shall (a king) multiply wives for himself, lest his heart turn away (Deuteronomy 17:17)

The Hebrew word translated ‘multiply’ isרָבָה rabah and it is found in the first commandment given to humankind.

‘Be fruitful and multiply…’ (Genesis 1:28)

But in the head quotation, Moses is relaying instructions for the establishment of monarchy for the time when the Israelites will demand that they have a king as do other nations.