Answer:
1. It's because it represents the beginning of the Christian Church. ... It reminds them how Jesus' promise that God would send the Holy Spirit was fulfilled.
2. In Acts 2:17, it reads: "'And in the last days,' God says, 'I will pour out my spirit upon every sort of flesh, and your sons and your daughters will prophesy and your young men will see visions and your old men will dream dreams.
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