Acts 19:5 Meaning

3And he said unto them, Unto what then were ye baptized? And they said, Unto John's baptism.

4Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe on him which should come after him, that is, on Christ Jesus.

5When they heard this, they were baptized in the name of the Lord Jesus.

6And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied.

7And all the men were about twelve.