6 Then one of the seraphim flew to me with a live coal in his hand, which he had taken with tongs from the altar. 7 With it he touched my mouth and said, "See, this has touched your lips; your guilt is taken away and your sin atoned for." 8 Then I heard the voice of the Lord saying, "Whom shall I send? And who will go for us?"
And I said, "Here am I. Send me!"
Isaiah 6:6-8 NIV
This third I will put into the fire;
I will refine them like silver
and test them like gold.
They will call on my name
and I will answer them;
I will say, 'They are my people,'
and they will say, 'The LORD is our God.'"
Zechariah 13:9 NIV
1 When the day of Pentecost came, they were all together in one place. 2 Suddenly a sound like the blowing of a violent wind came from heaven and filled the whole house where they were sitting. 3 They saw what seemed to be tongues of fire that separated and came to rest on each of them. 4 All of them were filled with the Holy Spirit and began to speak in other tongues[a] as the Spirit enabled them.
Acts 2:1-4 NIV
for our "God is a consuming fire."[a]
Hebrews 12:29 NIV