At Pentecost, what came to rest on each of those gathered?

Answer: Tongues like fire

On the day of Pentecost they saw tongues like flames of fire that separated and came to rest on each of them.

“When the day of Pentecost came, they were all together in one place. Suddenly a sound like a mighty rushing wind came from heaven and filled the whole house where they were sitting. They saw tongues like flames of fire that separated and came to rest on each of them.”— Acts 2:1-3 (BSB)