. Fire is a often used word in the Bible to explain God's holiness and purity.
. Speaking of tongues could mean that their tongues are so impure, that when God speaks through them verbally it is considered speaking in tongues, because it isn't their normal speech.
. They were empowered with the Holy Spirit at that moment, and it spoke through them.
. Maybe this symbolizes God's cleansing of their sin, because God now dwells inside them and speaks through them.
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