John Gill Commentary Acts 8:29

"And the Spirit said unto Philip, Go near, and join thyself to this chariot." — Acts 8:29 (ASV)

Then the Spirit said to Philip Not the angel, a ministering Spirit, as in (Acts 8:26) but the Holy Spirit, as the Syriac and Ethiopic versions read, the same with the Spirit of the Lord, (Acts 8:39) who spoke to him, either by an articulative voice, such as was the Bath Kol among the Jews; or inwardly, by a secret impulse upon him, he directed him, saying:

go near, and join yourself to this chariot ; he told him make up to the chariot, he saw driving on the road at such a distance, and follow it, and attend it closely; and not leave it, till an opportunity of conversing with the person in it offered.