It is said in the Acts of the Apostles, that when the days of Pentecost were ended, and whilst they were all together in one place, suddenly there came from heaven the sound of the Holy Spirit, and it filled the chamber wherein they were gathered together; and there appeared as it were tongues of fire, and rested on each of them. And they were filled with the spirit of power, and they all began to speak the tongues of all countries, each a different tongue, according as the Holy Spirit gave them power. And there were good men in Jerusalem from every nation, and when they heard the report of this, they all gathered together; and they were amazed, for they heard the Apostles talking the languages of their native countries. And they were astonished, and they marveled, and said, “Are not all these men of Galilee whom we hear speaking the languages of our native countries, Parthia, Media and Elam, and the languages of those who dwell between the rivers (i.e. in Mesopotamia), and Judea, and Cappadocia, and Phrygia, and Pamphylia, and Egypt, and the borders of Libya, and those who are from Cyrene, and those who speak Rumi , and Jews, and pilgrims, Cretans, and Arabians. Behold we hear them speaking in the languages of our own countries concerning the great things of God”; and they were amazed, and were unable to speak.
And they said among themselves, “What is this?” And some of them laughed, and said, “These men are filled with new wine.” And Peter stood up among the eleven [Apostles], and cried out with a loud voice, saying, “O all ye men of Judea and ye who dwell in Jerusalem, know ye, and hearken unto my voice. These men are not drunk as ye think, and say, for it is only now three hours since day dawned on the earth.” This is what the prophet Joel said, “And it shall come to pass after this that I will pour out my spirit upon all souls, and your sons and you daughters shall prophesy, and your young men shall see visions and your old men dream dreams” (Joel ii, 28). .. .. .. when he also told them from the Book of David and other books they were cut to the heart, and said to peter and the rest of the apostles “ Men and brethren, what shall we do?” Then peter said to them “Repent, and let every one of you be baptized in the name of Jesus Christ for the remission of sins and you shall receive the gift of the Holy Spirit. .. .. .. ” then those who gladly received his word were baptized. And that day about three thousand souls were added to them. And the lord added to the church daily those who were being saved.
After the feast of Pentecost, they fasted for forty days and gave thanks unto Him.