The priest shall wave them with the bread of the firstfruits as a wave offering before the Lord, with the two lambs. They shall be holy to the Lord for the priest. And you shall proclaim on the same day that it is a holy convocation to you. You shall do no customary work on it. Accompanied by fire, the Almighty wrote the Ten Commandments for the children of Israel.
Fire is an important element in Pentecost.
When the Day of Pentecost had 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 the whole house where they were sitting. Then there appeared to them divided tongues, as of fire, and one sat upon each of them. Once again the fire of God appeared, but this time to His trusted friends. Peter, the man who had backslidden and even denied knowing the Messiah three times, now rose with courage and gave his first sermon.