Philip preached the good news about Jesus to the eunuch, beginning with the passage in Isaiah 53 that the Ethiopian had been reading, and then other elements of the good news about Jesus.
Philip would have told him about the hideousness of his sin. Philip would have told him about the scale of God’s wrath against sin. Philip also would have shown the eunuch, especially from Isaiah 53, the cross of Christ and how that was the Lord Jesus taking his people’s sin upon himself as the sacrificial Lamb of God.
He also would have urged the Ethiopian to respond by trusting in the Lord Jesus Christ, repenting of his sins, believing that he would not be turned away.
Finally, Philip would have explained that one central part of that response of faith in the Lord Jesus was baptism, administered by the church in a public setting to all true believers.
