Acts 2:4 immediately follows: the tongues of fire are the visible sign of the Spirit filling that then enables speaking in tongues.

Acts 2:11 reports the result: people hearing their own languages spoken. The fire here initiates that miracle.

Acts 1:15 notes the 120 believers gathered — the same group who received the tongues of fire at Pentecost here.

In Genesis 11:6, human unity in language led to pride and scattering; at Pentecost, the Spirit's tongues reverse Babel's confusion.

In Matthew 3:11, John predicts baptism with the Holy Spirit and fire — here tongues of fire fulfill that promise.

John 1:33 prophesies Jesus baptizing with the Holy Spirit — fulfilled here as the tongues of fire and Spirit outpouring.

In 1 Corinthians 12:10, tongues appear as one of the Spirit's gifts, directly echoing the Pentecost event described here.

In James 3:6, the tongue is a fire of unrighteousness — here tongues of fire are the Holy Spirit empowering righteous witness, a direct contrast.

Luke 3:16 predicts baptism with the Holy Spirit and fire — exactly what occurs here with the tongues of fire.

John 1:32 records the Spirit descending like a dove on Jesus — a parallel visible manifestation of the Spirit, here as tongues of fire.

Isaiah 11:2 describes the Spirit resting on the Messiah — a parallel to the Spirit descending in fire here, though on the church.

In Jeremiah 23:29, God's word is like fire — here, tongues of fire symbolize the Spirit empowering the proclamation of that word.