Thomas Aquinas

Third, he shows the manner of their flight, as to purity: be clean, you priests; as to security: for you shall not go out in a tumult, namely, of war, as you did from Egypt: he brought forth his people (Ps 104:43); as to their leader: for the Lord will go before you, as a leader, and the God of Israel will gather you together, as a shepherd: for I will take you from among the Gentiles, and will gather you together out of all the countries, and will bring you into your own land (Ezek 36:24).

Commentary on Isaiah ↗