Though Shem and Japheth both showed themselves to be dutiful and deferential, yet it was Shem who deserved the larger meed of praise. He was the first to set about covering his father. Japheth joined him after the good deed had been begun. Therefore the descendants of Shem received as their special reward the tallit, the garment worn by them, while the Japhethites have only the toga. A further distinction accorded to Shem was the mention of his name in connection with God's in the blessing of Noah. "Blessed be the Lord, the God of Shem," he said, though as a rule the name of God is not joined to the name of a living person, only to the name of one who has departed this life.
The Great Flood of Shem
Legends of the Jews 4:78