Gave heed; a good preparation towards their conversion, seeing faith cometh by hearing, Romans 10:17. Hearing and seeing the miracles which he did; these miracles were as so many evidences of the truth he spake, by which he showed God's authority for what he said.
Related Commentaries of Acts 8:6
Acts 8:6
6 And the people with one accord gave heed unto those things which Philip spake, hearing and seeing the miracles which he did.