6 When the crowds heard Philip and saw the signs he performed, they all paid close attention to what he said.

Read Acts 8:6 Using Other Translations

And the people with one accord gave heed unto those things which Philip spake, hearing and seeing the miracles which he did.
And the crowds with one accord paid attention to what was being said by Philip when they heard him and saw the signs that he did.
Crowds listened intently to Philip because they were eager to hear his message and see the miraculous signs he did.