‏ Deuteronomy 17:15-20

Verse 15

One from among thy brethren shalt thou set king over thee - It was on the ground of this command that the Jews proposed that insidious question to our Lord, Is it lawful to give tribute to Caesar, Or No? Mat 22:17; for they were then under the authority of a foreign power. Had Christ said Yes, then they would have condemned him by this law; had he said No, then they would have accused him to Caesar. See this subject discussed in great detail in the notes, Mat 22:16 (note), etc.
Verse 16

He shall not multiply horses - As horses appear to have been generally furnished by Egypt, God prohibits these,

1. Lest there should be such commerce with Egypt as might lead to idolatry.

2. Lest the people might depend on a well-appointed cavalry as a means of security, and so cease from trusting in the strength and protection of God. And,

3. That they might not be tempted to extend their dominion by means of cavalry, and so get scattered among the surrounding idolatrous nations, and thus cease, in process of time, to be that distinct and separate people which God intended they should be, and without which the prophecies relative to the Messiah could not be known to have their due and full accomplishment.
Verse 17

Neither shall he multiply wives - For this would necessarily lead to foreign alliances, and be the means of introducing the manners and customs of other nations, and their idolatry also. Solomon sinned against this precept, and brought ruin on himself and on the land by it; see 1Kgs 11:4.
Verse 18

He shall write him a copy of this law - משנה התורה הזאת mishneh hattorah hazzoth, an iteration or duplicate of this law; translated by the Septuagint, το δευτερονομιον τουτο this deuteronomy. From this version both the Vulgate Latin and all the modern versions have taken the name of this book; and from the original word the Jews call it Mishneh. See the preface to this book.

Out of that which is before the priests the Levites - It is likely this means, that the copy which the king was to write out was to be taken from the autograph kept in the tabernacle before the Lord, from which, as a standard, every copy was taken and with which doubtless every copy was compared; and it is probable that the priests and Levites had the revising of every copy that was taken off, in order to prevent errors from creeping into the sacred text.
Verse 19

And it shall be with him, etc. - It was the surest way to bring the king to an acquaintance with the Divine law to oblige him to write out a fair copy of it with his own hand, in which he was to read daily. This was essentially necessary, as these laws of God were all permanent, and no Israelitish king could make any new law, the kings of this people being ever considered as only the vice-gerents of Jehovah.
Verse 20

He, and his children, in the midst of Israel - From this verse it has been inferred that the crown of Israel was designed to be hereditary, and this is very probable; for long experience has proved to almost all the nations of the world that hereditary succession in the regal government is, on the whole, the safest, and best calculated to secure the public tranquillity.

Copyright information for Clarke