Jesus said to him, “If you can believe, all things are possible to him who believes.” Mark 9:23

So they said, “Believe on the Lord Jesus Christ, and you will be saved, you and your household.” Acts 16:31

…he said to them, “Did you receive the Holy Spirit when you believed?” So they said to him, “We have not so much as heard whether there is a Holy Spirit.” Acts 19:2