“And in the last days it shall be, God declares, that I will pour out my Spirit on all flesh, and your sons and your daughters shall prophesy …”
Peter, quoting scripture at Pentecost to explain why Parthian, Median and Egyptian Jews were hearing Galileans speaking their native languages, preceded these prophetic words with the statement “This is what was uttered through the prophet Joel.”
Hey, if Peter says so, I believe him.