The Spirit in the Old Testament          

     And afterword, I will pour out my Spirit on all people. Your sons and your daughters will prophesy, your old men will dream dreams, your young men will see visions. Even on my servants, both men and women, I will pour out my Spirit in those days. - Joel 2:28-29

The Spirit in the New Testament 

     John (the Baptist) said, "I saw the Spirit come down from heaven as a dove and remain on him (Jesus). The man...is he who will baptize with the Holy Spirit. ...this is the Son of God. - (the disciple) John 1:32-34      

     Years later: When the day of Pentecost came, they were all together in one place. Suddenly, a sound like the blowing of a violent wind came from heaven and filled the whole house where they were sitting. 

     They saw what seemed to be tongues of fire that separated and came to rest on each of them. All of them were filled with the Holy Spirit and began to speak in other tongues as the Spirit enabled them.

     Now there were staying in Jerusalem God-fearing Jews from every nation under heaven. When they heard this sound, a crowd came together in bewilderment, because each one heard them speaking in his own language. Utterly amazed, they asked: Are not all these men Galileans? Then how is it that each one of us hears them in his own native language? - Acts 2:1-8

Verses 9-11 mention 13 nations and regions.

     ...we hear them declaring the wonders of God in our own tongues! Amazed and perplexed, they asked one another, "What does this mean?" 

NOTE: We find the Spirit in numerous Old Testament books, beginning with chapter 1 of Genesis, verse 2. Later, God may have given Joel a forecast of the Pentecost event, or maybe he was combining that and other occurrences to follow. Only God would know.