While Peter was still speaking these words, the Holy Spirit fell upon all who heard his message.
44. And as Peter yet spake. God declareth now by a new miracle, that the doctrine of the gospel is common as well to the Gentiles as to the Jews. And this is an excellent seal of the calling of the Gentiles; because the Lord would never have vouchsafed to bestow upon the Gentiles the graces of his Spirit, unless it had been to declare...
While Peter was still preaching, God interrupted him with the Holy Ghost falling on all who heard. The Spirit came before baptism, before circumcision, because God is not bound to our methods. He proved Peter was sent by Him and showed that the Spirit, not the flesh, quickens. Abraham was justified in uncircumcision; these Gentiles received the Spirit unbaptized.
AI summary
Commenting on Acts 10:44-48
While Peter yet spake these words,.... As he was thus discoursing concerning Christ, his person, his miracles, his death and resurrection, and the efficacy of his blood for pardon, before he had done speaking, the Holy Ghost fell on all them which heard the word.