en_tn/act/02/18.md

Peter continues to quote the prophet Joel in his speech to the Jews that he began in Acts 1:15.

servants...female servants

In the Old Testament, God's prophets and other people who worshiped God are often referred to as his “servants.”

I will pour out my Spirit

God gives his Spirit generously.

prophesy

God inspires them to speak God's truth.

vapor

"mist" or "fog"

pour out

This is like someone emptying out a lot of water from a pitcher or a bucket.