It is interesting to see that Luke the author of Acts makes a distinction between the baptism of John and the baptism that Jesus commanded (Matt. 28:19) which began to be given to believers in Jesus on or after Pentecost. (Acts 2:41, 8:12 etc).
We might gather from this that, whilst it was recognized that Apollos had a good grasp of the Gospel concerning Jesus’ life and teaching and taught well and accurately, he may not have known about Jesus’ death, resurrection, ascension and the outpouring of the Holy Spirit at Pentecost, thus his knowledge may not have been as complete as it might have been.
It is evident that Luke considered the baptism in, or outpouring of, the Holy Spirit upon each believer as essential for a fuller understanding of the Gospel of Jesus Christ.
With the evidence throughout Scripture of the role of the Holy Spirit in the development and fulfillment in the knowledge and understanding of the Gospel – it can be something of a mystery as to why so many believers seem to actively resist anything to do with the Holy Spirit and thus deprive themselves of a deeper relationship with the whole of the Trinity.
So you must go and make disciples of all nations. Baptize them in the name of the Father and of the Son and of the Holy Spirit. (Matt. 28:19 RSV)
But the Father will send the Friend in my name to help you. The Friend is the Holy Spirit. He will teach you all things. He will remind you of everything I have said to you. (Jn. 14:6 RSV)
When he said this, he meant the Holy Spirit. Those who believed in Jesus would receive the Spirit later. Up to that time, the Spirit had not been given. This was because Jesus had not yet received glory. (Jn. 7:39 RSV)
He said, ‘In the last days, God says, I will pour out my Holy Spirit on all people. Your sons and daughters will prophesy. Your young men will see visions. Your old men will have dreams. (Acts 2:17 RSV)
Peter replied, “All of you must turn away from your sins and be baptized in the name of Jesus Christ. Then your sins will be forgiven. You will receive the gift of the Holy Spirit. (Acts 2:38 RSV)