To enquire of God - The decisions of Moses were doubtless accepted by the people as oracles. The internal prompting of the Spirit was a sufficient guidance for him, and a sufficient authority for the people.

The people come unto me to inquire of God - To know the mind and will of God on the subject of their inquiries. Moses was the mediator between God and the people; and as they believed that all justice and judgment must come from him, therefore they came to Moses to know what God had spoken.

And Moses said unto his father in law,.... In answer to his question; and there were two things, as Aben Ezra observes, he did to the people, and for which they came to him; the one is observed in this verse, and the other in the next:

because the people come unto me to inquire of God; of his mind and will in certain cases, and of his statutes and laws, as the following verse shows; what they should observe, and according to which they should conduct themselves: they came to inquire what God would have them to do; and, in doubtful cases, what was his will and pleasure, and to desire Moses to inform them; and if the things were of such a nature that he could not easily and readily do it, then to inquire of God for them, which in later times was done by Urim and Thummim.

And Moses said unto his father in law, Because the people come unto me to enquire of {g} God:

(g) That is, to know God's will, and to have justice executed.

18:15 The people came to enquire of God - And happy was it for them that they had such an oracle to consult. Moses was faithful both to him that appointed him, and to them that consulted him, and made them know the statutes of God, and his laws - His business was not to make laws, but to make known God's laws: his place was but that of a servant.

18:13-27 Here is the great zeal and the toil of Moses as a magistrate. Having been employed to redeem Israel out of the house of bondage, he is a further type of Christ, that he is employed as a lawgiver and a judge among them. If the people were as quarrelsome one with another as they were with God, no doubt Moses had many causes brought before him. This business Moses was called to; it appears that he did it with great care and kindness. The meanest Israelite was welcome to bring his cause before him. Moses kept to his business from morning to night. Jethro thought it was too much for him to undertake alone; also it would make the administration of justice tiresome to the people. There may be over-doing even in well-doing. Wisdom is profitable to direct, that we may neither content ourselves with less than our duty, nor task ourselves beyond our strength. Jethro advised Moses to a better plan. Great men should not only study to be useful themselves, but contrive to make others useful. Care must be taken in the choice of the persons admitted into such a trust. They should be men of good sense, that understood business, and that would not be daunted by frowns or clamours, but abhorred the thought of a bribe. Men of piety and religion; such as fear God, who dare not to do a base thing, though they could do it secretly and securely. The fear of God will best fortify a man against temptations to injustice. Moses did not despise this advice. Those are not wise, who think themselves too wise to be counselled.