CHAPTER 17 Apr. 30 
You must not sacrifice to Yahweh your God an ox or a sheep in which is a blemish or anything imperfect, for that is an abomination to Yahweh your God. 2If there is found in the midst of you, within any of your gates which Yahweh your God gives you, a man or woman who does that which is evil in the sight of Yahweh your God in transgressing His covenant, 3and has gone and served other gods and worshipped them, or the sun or the moon or any of the army of the sky, which I have not commanded, 4and it is told you and you have heard of it, then you must inquire diligently. Behold, if it is true and certain that such abomination is done in Israel, 5then you must bring forth that man or that woman who has done this evil thing to your gates, even the man or the woman, and you shall stone them to death with stones. 6At the mouth of two or three witnesses shall he who is to die be put to death. At the mouth of one witness he must not be put to death. 7The hand of the witnesses must be first on him to put him to death, and afterward the hand of all the people. So you shall put away the evil from the midst of you.
Judging
 8If there arises a matter too hard for you in judgment, between blood and blood, between plea and plea and between stroke and stroke, being matters of controversy within your gates, then go up to the place which Yahweh your God shall choose, 9and come to the priests the Levites and to the judge who shall be in those days and ask. They shall show you the sentence of judgment. 10You must do according to the sentence which they shall show you from that place which Yahweh shall choose, and you must observe to do according to all that they shall teach you; 11according to the law which they shall teach you and according to the judgment which they shall tell you, that you shall do. You must not turn aside from the sentence which they shall show you, to the right hand or to the left. 12The man who does presumptuously in not listening to the priest who stands to minister there before Yahweh your God, or to the judge, that man shall die, and you must put away the evil from Israel. 13All the people shall hear and fear and do no more presumptuously.
Rules for a King
14When you have come to the land which Yahweh your God gives you and shall possess it, and dwell therein and say, I will set a king over me like all the nations that are around me, 15you must surely set him king over yourselves whom Yahweh your God shall choose; one from among your brothers you shall set king over you. You may not put a foreigner over you, who is not your brother. 16Only he must not multiply horses to himself, nor cause the people to return to Egypt, so that he may multiply horses, because Yahweh has said to you, You shall not go back that way again. 17Neither shall he multiply wives to himself, so that his heart will not turn away; neither shall he greatly multiply to himself silver and gold. 18When he sits on the throne of his kingdom, he must write for himself a copy of this law in a book, out of that which is before the priests, the Levites. 19It shall be with him and he must read from it all the days of his life, so that he may learn to fear Yahweh his God, to keep all the words of this law and these statutes, to do them. 20Thus his heart will not be raised up above his brothers, and he will not turn aside from the commandment to the right hand or to the left, so that he may prolong his days in his kingdom, he and his children, in the midst of Israel.

Commentary

17:6 Insisting on more than one witness before accepting the truth of an allegation meant that gossip and slander were limited; and Jesus applies this principle to dealing with disputes within His church (Mt. 18:16). Those who served other gods had to die on the testimony of two or three witnesses. This idea is twice alluded to in the New Testament in the context of making the decision to cease fellowship with someone (Mt. 18:16; 2 Cor. 13:1). The implication is that death under the Old Covenant pointed forward to church discipline under the New Covenant. But we must note that the reason for this was serving other gods and wilful departing from covenant relationship with the Lord- not minor reasons.
17:14 Moses often reminds them that he knows that they will turn away from the Covenant he had given them (e.g. 30:1; 31:29). Here he shows that he knew that one day they would want a king, even though God was their king. He had such sensitivity to their weakness and likely failures, and in some areas he makes concessions to them. 
17:16 Moses commands any future king not to send God's people to Egypt to buy horses because he could see that this would tempt them to go back to Egypt permanently. There are many other example of this kind of thing (Dt. 14:24; 15:18; 17:17-19; 18:9; 20:7,8). The point is that Moses had thought long and hard about the ways in which Israel would be tempted to sin, and his words and innermost desire were devoted to helping them overcome. Glorious ditto for the Lord Jesus whom he typified (18:18). Note that the king was warned not to get horses for himself from Egypt because the very fact of sending Israelites back into Egypt might tempt them to return there; we are to be sensitive to the spiritual effect our actions may have upon others.
17:16-20 This has strong relevance to Solomon. He did multiply silver, gold, horses and wives; his heart was turned away (:16,17= 2 Chron. 9:20).  Yet this passage says that if he studied the Law all his life, this would not happen, and also his heart would not be "lifted up above his brethren" (:20). Solomon's whipping of the people and sense of spiritual and material superiority (Ecc. 1:16;  2:7,9) shows how his heart was  lifted up. Yet Solomon knew the Law, despite his explicit disobedience to the commands concerning wives, horses etc.  But his knowledge of the word didn't bring forth the true humility which it was intended to. Solomon assumed  he wasn't proud;  he assumed God’s word was having its intended effect upon him, when it wasn’t. Such spiritual assumption is a major temptation for every child of God. God’s intention that the king of Israel should personally copy out all the commandments of the Law was “to the end that his heart will not be raised up above his brothers”- i.e. reflecting upon the many requirements of the Law would’ve convicted the King of his own failure to have been fully obedient, and therefore his heart would be humbled. And soon after this statement, we are hearing Moses reminding Israel that Messiah, the prophet like unto Moses, was to be raised up (18:18). Human failure, and recognition of it, prepares us to accept Christ.