Matthew 2:19

We have here Christ's return out of Egypt into the land of Israel again. Egypt may serve to sojourn in, or take shelter in, for a while, but not to abide in. Christ was sent to the lost sheep of the house of Israel, and therefore to them he must return. Observe, I. What it was that made way for his return - the death of Herod, which happened not long after the murder of the infants; some think not above three months. Such quick work did divine vengeance make! Note, Herods must die; proud tyrants, that were the terror of the mighty, and the oppressors of the godly, in the land of the living, their day must come to fall, and down to the pit they must go. Who art thou then, that thou shouldest be afraid of a man that shall die? (Isa 51:12, Isa 51:13) especially considering that at death, not only their envy and hatred are perished (Ecc 9:6), and they cease from troubling (Job 3:17), but they are punished. Of all sins, the guilt of innocent blood fills the measure soonest. It is a dreadful account which Josephus gives of the death of this same Herod (Antiq. 17.

— Matthew Henry's Concise Commentary (public domain)

But when Herod was dead--Miserable Herod! Thou thoughtest thyself safe from a dreaded Rival; but it was He only that was safe from thee; and thou hast not long enjoyed even this fancied security. See on Mat 2:15. behold, an angel of the Lord appeareth in a dream to Joseph in Egypt--Our translators, somewhat capriciously, render the same expression "the angel of the Lord," Mat 1:20; Mat 2:13; and "an angel of the Lord," as here. As the same angel appears to have been employed on all these high occasions--and most likely he to whom in Luke is given the name of "Gabriel," Luk 1:19, Luk 1:26 --perhaps it should in every instance except the first, be rendered "the angel."

— Jamieson-Fausset-Brown Commentary (public domain)