Thus shalt thou say to the house of Jacob, and Israel The people are called by the names both of Jacob and Israel, to remind them that they who had 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.
Related Commentaries of Exodus 19:3
Exodus 19:3
3 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 Jacob, and tell the children of Israel;