And Moses went up unto God, and the LORD called unto him out of the mountain, saying, Thus shalt thou say to the house of {c} Jacob, and tell the children of Israel;

(c) God called Jacob, Israel: therefore the house of Jacob and the people of Israel signify God's people.

Wesley's Notes

19:3 Thus shalt thou say to the house of Jacob, and the children of Israel - The people are called by the names both of Jacob and Israel, to mind them that they who had lately been as low as Jacob when he went to Padan - aram, were now grown as great as God made him when he came from thence, and was called Israel.

Scofield Reference Notes

[3] Thus shalt thou say

It is exceedingly important to observe:

(1) that Jehovah reminded the people that hitherto they had been the objects of His free grace;

(2) that the law is not proposed as a means of life, but as a means by which Israel might become "a peculiar treasure" and a "kingdom of priests";

(3) that the law was not imposed until it had been proposed and voluntarily accepted. The principle is stated in Gal 5:1-4.

Jamieson-Fausset-Brown Bible Commentary

3-6. Moses went up unto God-the Shekinah-within the cloud (Ex 33:20; Joh 1:18).

Thus shalt thou say to the house of Jacob, &c.-The object for which Moses went up was to receive and convey to the people the message contained in these verses, and the purport of which was a general announcement of the terms on which God was to take the Israelites into a close and peculiar relation to Himself. In thus negotiating between God and His people, the highest post of duty which any mortal man was ever called to occupy, Moses was still but a servant. The only Mediator is Jesus Christ [1Ti 2:5; Heb 12:24].

Matthew Henry's Concise Commentary

19:1-8 Moses was called up the mountain, and was employed as the messenger of this covenant. The Maker and first Mover of the covenant, is God himself. This blessed charter was granted out of God's own free grace. The covenant here mentioned was the national covenant, by which the Israelites were a people under the government of Jehovah. It was a type of the new covenant made with true believers in Christ Jesus; but, like other types, it was only a shadow of good things to come. As a nation they broke this covenant; therefore the Lord declared that he would make a new covenant with Israel, writing his law, not upon tables of stone, but in their hearts, Jer 31:33; Heb 8:7-10. The covenant spoken of in these places as ready to vanish away, is the national covenant with Israel, which they forfeited by their sins. Unless we carefully attend to this, we shall fall into mistakes while reading the Old Testament. We must not suppose that the nation of the Jews were under the covenant of works, which knows nothing of repentance, faith in a Mediator, forgiveness of sins, or grace; nor yet that the whole nation of Israel bore the character, and possessed the privileges of true believers, as being actually sharers in the covenant of grace. They were all under a dispensation of mercy; they had outward privileges and advantages for salvation; but, like professing Christians, most rested therein, and went no further. Israel consented to the conditions. They answered as one man, All that the Lord hath spoken we will do. Oh that there had been such a heart in them! Moses, as a mediator, returned the words of the people to God. Thus Christ, the Mediator, as a Prophet, reveals God's will to us, his precepts and promises; and then, as a Priest, offers up to God our spiritual sacrifices, not only of prayer and praise, but of devout affections, and pious resolutions, the work of his own Spirit in us.