The Feast of Harvest or First Fruits
Exodus 32:1-4,15-35 NKJV
 Now when the people saw that Moses delayed coming down from the mountain, the people gathered together to Aaron, and said to him, “Come, make us gods that shall go before us; for as for this Moses, the man who brought us up out of the land of Egypt, we do not know what has become of him.”  And Aaron said to them, “Break off the golden earrings which are in the ears of your wives, your sons, and your daughters, and bring them to me.”  So all the people broke off the golden earrings which were in their ears, and brought them to Aaron.  And he received the gold from their hand, and he fashioned it with an engraving tool, and made a molded calf. Then they said, “This is your god, O Israel, that brought you out of the land of Egypt!”  And Moses turned and went down from the mountain, and the two tablets of the Testimony were in his hand. The tablets were written on both sides; on the one side and on the other they were written.  Now the tablets were the work of God, and the writing was the writing of God engraved on the tablets.  And when Joshua heard the noise of the people as they shouted, he said to Moses, “There is a noise of war in the camp.”  But he said: “It is not the noise of the shout of victory, Nor the noise of the cry of defeat, But the sound of singing I hear.”  So it was, as soon as he came near the camp, that he saw the calf and the dancing. So Moses’ anger became hot, and he cast the tablets out of his hands and broke them at the foot of the mountain.  Then he took the calf which they had made, burned it in the fire, and ground it to powder; and he scattered it on the water and made the children of Israel drink it.  And Moses said to Aaron, “What did this people do to you that you have brought so great a sin upon them?”  So Aaron said, “Do not let the anger of my lord become hot. You know the people, that they are set on evil.  For they said to me, ‘Make us gods that shall go before us; as for this Moses, the man who brought us out of the land of Egypt, we do not know what has become of him.’  And I said to them, ‘Whoever has any gold, let them break it off.’ So they gave it to me, and I cast it into the fire, and this calf came out.”  Now when Moses saw that the people were unrestrained (for Aaron had not restrained them, to their shame among their enemies),  then Moses stood in the entrance of the camp, and said, “Whoever is on the LORD’s side-come to me!” And all the sons of Levi gathered themselves together to him.  And he said to them, “Thus says the LORD God of Israel: ‘Let every man put his sword on his side, and go in and out from entrance to entrance throughout the camp, and let every man kill his brother, every man his companion, and every man his neighbor.'”  So the sons of Levi did according to the word of Moses. And about three thousand men of the people fell that day.  Then Moses said, “Consecrate yourselves today to the LORD, that He may bestow on you a blessing this day, for every man has opposed his son and his brother.”  Now it came to pass on the next day that Moses said to the people, “You have committed a great sin. So now I will go up to the LORD; perhaps I can make atonement for your sin.”  Then Moses returned to the LORD and said, “Oh, these people have committed a great sin, and have made for themselves a god of gold!  Yet now, if You will forgive their sin-but if not, I pray, blot me out of Your book which You have written.”  And the LORD said to Moses, “Whoever has sinned against Me, I will blot him out of My book.  Now therefore, go, lead the people to the place of which I have spoken to you. Behold, My Angel shall go before you. Nevertheless, in the day when I visit for punishment, I will visit punishment upon them for their sin.”  So the LORD plagued the people because of what they did with the calf which Aaron made.
Acts 2:1-4 KJV
 And when the day of Pentecost was fully come, they were all with one accord in one place.  And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting.  And there appeared unto them cloven tongues like as of fire, and it sat upon each of them.  And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.
Mark 16:15-18 KJV
 And he said unto them, Go ye into all the world, and preach the gospel to every creature.  He that believeth and is baptized shall be saved; but he that believeth not shall be damned.  And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues;  They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.
Acts 10:44-48 KJV
 While Peter yet spake these words, the Holy Ghost fell on all them which heard the word.  And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost.  For they heard them speak with tongues, and magnify God. Then answered Peter,  Can any man forbid water, that these should not be baptized, which have received the Holy Ghost as well as we?  And he commanded them to be baptized in the name of the Lord. Then prayed they him to tarry certain days.
Acts 19:1-6 KJV
 And it came to pass, that, while Apollos was at Corinth, Paul having passed through the upper coasts came to Ephesus: and finding certain disciples,  He said unto them, Have ye received the Holy Ghost since ye believed? And they said unto him, We have not so much as heard whether there be any Holy Ghost.  And he said unto them, Unto what then were ye baptized? And they said, Unto John’s baptism.  Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe on him which should come after him, that is, on Christ Jesus.  When they heard this , they were baptized in the name of the Lord Jesus.  And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied.