Jamieson, Fausset and Brown on Matthew 1:21

21. And she shall bring forth a son--Observe, it is not said, "she shall bear thee a son," as was said to Zacharias of his wife Elizabeth (Lu 1:13).

and thou--as his legal father.

shalt call his name JESUS--from the Hebrew meaning "Jehovah the Saviour"; in Greek Jesus--to the awakened and anxious sinner sweetest and most fragrant of all names, expressing so melodiously and briefly His whole saving office and work!

for he shall save--The "He" is here emphatic--He it is that shall save; He personally, and by personal acts (as Webster and Wilkinson express it).

his people--the lost sheep of the house of Israel, in the first instance; for they were the only people He then had. But, on the breaking down of the middle wall of partition, the saved people embraced the "redeemed unto God by His blood out of every kindred and people and tongue and nation."

from their sins--in the most comprehensive sense of salvation from sin (Re 1:5; Ep 5:25-27).