Pentecost
A sound from heaven, a fire that divides, and a flame resting on each of them. Scroll to watch it.
suddenly there came a sound from heaven as of the rushing of a 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 one of them, and they were all filled with the Holy Ghost.
Acts 2:2-4, as St Cyril of Jerusalem gives it
Observe how it is always, “like as;” and rightly: that you may have no gross sensible notions of the Spirit.
John Chrysostom, Homilies on Acts IV