The Holy Spirit cannot actually be poured out like water from a pitcher, but His descent is likened to something that is poured, because He came from above upon men on earth, and that coming was free to all upon whom he came. In the New Testament there are nine persons or groups said to have been filled with the Spirit. The baptism of the Spirit was not very strong and did not last long, necessitating a re-baptism every few days. The Baptism of the Holy Spirit was a promise, not a command. There are two distinct differences between truths, commands, promises, and blessings.
Truths are to be believed.
Commands are to be obeyed. Promises are to be received, and blessings are to be enjoyed. The Holy Spirit Baptism John Said Christ would baptize, etc. Luke is not giving an account of all 120 disciples who happened to be in Jerusalem, so in accounting for the actions of the apostles, he throws the entire number of disciples in within parentheses in verse 15. Luke inserts into his account of the apostles' actions in those days a quotation made by Peter in verses 15 through 22.