Shall ye observe all my statutes - חקתי chukkothi, from חק chak, to describe, mark, or trace out; the righteousness which I have described, and the path of duty which I have traced out. Judgments, משפטי mishpatai, from שפט shaphat, to discern, determine, direct, etc.; that which Divine Wisdom has discerned to be best for man, has determined shall promote his best interest, and has directed him conscientiously to use. See the note on Leviticus 26:15.
1. Many difficulties occur in this very important chapter, but they are such only to us; for there can be no doubt of their having been perfectly well known to the Israelites, to whom the precepts contained in this chapter were given. Considerable pains however have been taken to make them plain, and no serious mind can read them without profit.
2. The precepts against injustice, fraud, slander, enmity, etc., etc., are well worth the notice of every Christian; and those against superstitious usages are not less so; and by these last we learn, that having recourse to astrologers, fortune-tellers, etc., to get intelligence of lost or stolen goods, or to know the future events of our own lives, or those of others, is highly criminal in the sight of God. Those who have recourse to such persons renounce their baptism, and in effect renounce the providence as well as the word of God.
3. The precepts of humanity and mercy relative to the poor, the hireling, and the stranger, are worthy of our most serious regard. Nor are those which concern weights and measures, traffic, and the whole system of commutative justice, less necessary to be observed for the benefit and comfort of the individual, and the safety and prosperity of the state.

Therefore shall ye observe all my statutes, and all my judgments,.... Delivered in this and the preceding chapters, and elsewhere, whether ceremonial or judicial, or moral, as there were of each, which had been delivered to them; and which are all comprehended in these two words, "statutes", or ordinances, which were the determinations of his sovereign will, and of mere positive institution; and "judgments", which were such laws as respected their civil or religious conduct, formed according to the rules of justice and equity: "all" and everyone of which were to be "observed", taken notice of, and regarded, in order to be put in practice, as follows:
and do them; act according to them, in civil, moral, and religious life:
I am the Lord; who enjoined all these things, and had a right to do so, and expected obedience to them, which it was right fit that they should give.

I am the Lord--This solemn admonition, by which these various precepts are repeatedly sanctioned, is equivalent to "I, your Creator--your Deliverer from bondage, and your Sovereign, who have wisdom to establish laws, have power also to punish the violation of them." It was well fitted to impress the minds of the Israelites with a sense of their duty and God's claims to obedience.

Concluding exhortation, summing up all the rest.

Therefore - Because my blessings and deliverances are not indulgences to sin, but greater obligations to all duties to God and men.