Joseph naturally dreads his marriage to the young maiden, Mary since she is pregnant; and that, out of wedlock. Joseph ought to report Mary, have her stoned to death per the Law of Moses. Yet, he listens to the angel of the Lord who comes to him in his sleep.
The angel of the Lord says something truly extraordinary, that Jesus “shall make His people safe from their sins.” The angel doesn’t say, “Jesus shall make His people free from sin.” Rather, the angel verifies that Jesus is to make His own people “safe from their sins.”
“But while he thinks these things, lo! the angel of the Lord appears to him in sleep, and says, Joseph, the son of David, do not thou dread to take Mary, thy wife; for that thing that is born in her is of the Holy Ghost. And she shall bear a son, and thou shalt call his name Jesus; for he shall make his people safe from their sins.”
That we sin is a fundamental truth in the Christian life. That Jesus died for our sins is also a fundamental truth of the Christian life. Jesus nails the Law to the tree, and washes away the wage of death with His blood.