Genesis 9:26 - Joseph Benson’s Commentary on the Old and New Testaments

Blessed be the Lord God of Shem Abraham and all his posterity were included in the descendants of Shem, as appears from the next chapter. Our Lord Jesus Christ, therefore, in whom all the nations of the earth are to be blessed, sprang from him. Well, therefore, might Jehovah be called the Lord God of Shem. Most of the worshippers of the true God, before the coming of the Messiah, were of his seed, and afterward the descendants of Shem were the chief instruments of bringing other nations to join in God's worship, and to partake of the blessings of his salvation. Thus Shem is well recompensed for his respect to his father, and the being thus informed of the blessings that awaited his posterity, must have been a great consolation to him, as it, no doubt, was afterward to the truly pious of his seed.