He will turn many of the children of Israel to the Lord, their God.
Luke spoke often of the people (Gr. laos) that God was preparing for Himself. These people prepared for the Lord included Jewish hearers but also those who formerly were not "a people" (1 Peter 2:10), namely, the Gentiles. They are the elect who would compose the church. With this word Luke constantly reminded his original Greek readers that God’s plan included Gentiles who responded to the gospel as well as Jews.