While Peter yet spake these words, the Holy Ghost fell on all them which heard the word. And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost. For they heard them speak with tongues, and magnify God. Then answered Peter, Acts 10:44-46
When Peter began to preach , the Holy Spirit fell upon , not just the Jews but also the Gentiles. This is the New Covenant, and this was a fulfillment of the vision Peter received earlier about God making all things clean. We are now Children of God through Jesus Christ, not Children of God because of our nationality or religion. Its only through Christ that we can be saved and reconciled back to God
It says they were astonished, probably due to the large number of people who became Born Again, but also because they were Gentiles. Christ didn’t come to just save Israel, he came to save the world!
Can any man forbid water, that these should not be baptized, which have received the Holy Ghost as well as we? And he commanded them to be baptized in the name of the Lord. Then prayed they him to tarry certain days. Acts 10:47-48
An interesting event then happened, who can be baptized? Can anyone forbid someone from wanting to be baptized? The answer is no, if someone is called to Christ, let them come to Christ and be baptized. The Gentiles didn’t need to be “Church members” for 6 months or were no newborn babies, they were filled with the Holy Spirit and wanted to profess their faith in Jesus Christ
Another interesting point is the Gentiles were already baptized by the Holy Spirit before being baptized by Water. As we know from Jesus, there are two baptisms, water and the spirit (John 3) The Gentiles received the Holy Spirit and now we’re ready to profess their faith in Christ with water. You don’t have to be one before the other, not everyone’s testimony is the same. We noticed in Acts also there were Christians who were baptized by water yet not baptized by the Holy Spirit yet.
This is testimony of the New Covenant, Jews and Gentiles becoming One through Jesus Christ! How can this be? Because of the baptisms of Spirit and Water, and the blood of our Lord Jesus Christ , Amen!