In the Book of Genesis, Noah is recorded as having, “three sons: Shem, Ham, and Japheth” (Genesis 6:10).
Shem is regarded as Noah’s “good” son and received his blessing.
Blessed be the Lord, the God of Shem!
Genesis 9:26–27
Let Canaan be his slave.
May God expand Japheth,
and may he dwell among the tents of Shem;
and let Canaan be his slave.
This makes Shem the bearer of God’s covenant and a direct ancestor of the Messiah.
The Catholic Encyclopediaexplains that “Noah’s prophetic words (according to Massoretic Text), ‘Blessed be Yahweh, the God of Sem’ … designate, in a special manner, Yahweh as the God of Sem and, consequently, Sem as the bearer of the Messianic promises .. .the Sacred Writer resumes (11:10 sqq.) the genealogy of the descendants of Arphaxad, the direct ancestor of Abraham, David, and Christ.”