The Pulpit Commentary - Deuteronomy 17:18
A copy of this law ; literally, a double of this Law , i . e . not, as the LXX . have it, "This reiteration of the Law" ( τὸ δευτερονόμιον τοῦτο ), but a duplicate or copy of the Pentateuchal Law. The Jews understand by "double" that two copies of the Law were to be made by the king (Maimon; ' De Regibus,' e. 3. § 1); but this is unnecessary: every copy of a law is a double of it. Oat of that which is before the priests . The priests were the custodians of the written Law ( ... read more
The Pulpit Commentary - Deuteronomy 17:16-17
Certain rules are prescribed for the king. It is forbidden to him to multiply horses, to multiply wives, and to amass large treasures of silver and gold, and he must have a copy of the Law written out for him from that kept by the priests, that he might have it by him, and read it all the days of his life. The multiplying of horses is prohibited, because this would bring Israel into intercourse and friendly relations with Egypt, and might tend to their going back to that country from which... read more