The day of Pentecost was such a miraculous day !!!
In the book of Acts chapter 2 . They all had to wait in the upper room for the promise. They didn’t know what the promise looked like nor how long they had to wait.
There was over 500 of them to begin with based on this scripture
1 Corinthians 15:6 After that He was seen by over five hundred brethren at once, of whom the greater part remain to the present, but some have fallen asleep.
After 10 days there was only 120 left in this upper room. What happened to the 380? What could possibly be the reason?
Maybe there was no food during this wait? We don’t know for sure, perhaps 10 days of fasting was way too much for some. Remember that the disciples didn’t fast as John’s disciples, nor the Pharisees. We know this because his disciples were accused of not fasting
Matthew 9:14-15 One day the disciples of John the Baptist came to Jesus and asked him, "Why don't your disciples fast like we do and the Pharisees do?"  Jesus replied, "Do wedding guests mourn while celebrating with the groom? Of course not. But someday the groom will be taken away from them, and then they will fast.
They were in unity and in one place. That alone is a miracle!!! Especially if they were fasting !!! Imagine containing your annoyance of a brother or sister on top of no food !!! I can barely do this with my husband let alone 500 people all waiting in an upper room. Did they stay there day and night? Did they only go to the upper room for 1 hour a day? Try saying to a believer today that God will give you your breakthrough by fasting and waiting in the upper room indefinitely You’ll have to rearrange all your schedule, take all your holiday hours, including leave and just wait in the upper room.
Scripture doesn’t expand except
One thing is for sure, they all saw fire which appeared to them as tongues of fire resting on their head. It was an obvious visual manifestation of the promise. And everyone who made it, stuck it out, pushed through, endured and never gave up, that morning were all filled with the Holy Spirit. They left the upper room with power all speaking in tongues
fully drunk or what it looked like to the onlookers in the market square 9 am that morning.
Peter using this opportunity to preach boldly to the gathering crowd proclaiming Joels prophecy of Gods Spirit being poured out, then of the glorious Gospel. Simeon’s prophecy was demonstrated that morning Luke 2:34-35
 Then Simeon bles