191 Now, it happened that while Apollos was away in Corinth, Paul made his way down through the mountains, came to Ephesus, and happened on some disciples there. 2 The first thing he said was, "Did you receive the Holy Spirit when you believed? Did you take God into your mind only, or did you also embrace him with your heart? Did he get inside you?" "We've never even heard of that - a Holy Spirit? God within us?" 3 "How were you baptized, then?" asked Paul. "In John's baptism." 4 "That explains it," said Paul. "John preached a baptism of radical life-change so that people would be ready to receive the One coming after him, who turned out to be Jesus. If you've been baptized in John's baptism, you're ready now for the real thing, for Jesus." 5 And they were. As soon as they heard of it, they were baptized in the name of the Master Jesus. 6 Paul put his hands on their heads and the Holy Spirit entered them. From that moment on, they were praising God in tongues and talking about God's actions.
Matthew Henry's Commentary on Acts 19:1-6
Commentary on Acts 19:1-7
(Read Acts 19:1-7)
Paul, at Ephesus, found some religious persons, who looked to Jesus as the Messiah. They had not been led to expect the miraculous powers of the Holy Ghost, nor were they informed that the gospel was especially the ministration of the Spirit. But they spake as ready to welcome the notice of it. Paul shows them that John never design that those he baptized should rest there, but told them that they should believe on Him who should come after him, that is, on Christ Jesus. They thankfully accepted the discovery, and were baptized in the name of the Lord Jesus. The Holy Ghost came upon them in a surprising, overpowering manner; they spake with tongues, and prophesied, as the apostles and the first Gentile coverts did. Though we do not now expect miraculous powers, yet all who profess to be disciples of Christ, should be called on to examine whether they have received the seal of the Holy Ghost, in his sanctifying influences, to the sincerity of their faith. Many seem not to have heard that there is a Holy Ghost, and many deem all that is spoken concerning his graces and comforts, to be delusion. Of such it may properly be inquired, "Unto what, then, were ye baptized?" for they evidently know not the meaning of that outward sign on which they place great dependence.