He said this in reference to the Spirit that those who came to believe in him were to receive. There was, of course, no Spirit yet, because Jesus had not yet been glorified. Discussion About the Origins of the Messiah.
But you will receive power when the holy Spirit comes upon you, and you will be my witnesses in Jerusalem, throughout Judea and Samaria, and to the ends of the earth.”
It was revealed to them that they were serving not themselves but you with regard to the things that have now been announced to you by those who preached the good news to you [through] the holy Spirit sent from heaven, things into which angels longed to look. Obedience.