Isaiah 32:15 prophecies the Spirit poured out from on high — foreshadowing the baptism with the Holy Spirit.

Isaiah 44:3 promises pouring out of God's Spirit — directly anticipating the Spirit baptism Jesus brings.

Ezekiel 36:27 promises God will put His Spirit within His people — a precursor to Jesus's Spirit baptism.

Joel 2:28 is the OT prophecy of Spirit outpouring that John's words echo — Jesus will fulfill this.

Matthew 3:11 gives a parallel account of John's statement, adding 'and fire' to the Spirit baptism.

Acts 1:5 repeats John's promise — Jesus himself confirms the coming Spirit baptism.

Acts 2:4 records the actual fulfillment — the disciples are baptized with the Holy Spirit at Pentecost.

Acts 2:17 cites Joel's prophecy, showing that the Spirit baptism John promised is the outpouring Peter witnesses.

Acts 10:45 shows the Spirit baptism promised in Mark 1:8 extended to Gentiles — a key expansion.

Acts 11:16 directly quotes the promise from Mark 1:8 — Peter recalls it as the explanation for Gentile Spirit baptism.

Acts 19:4-6 shows Paul applying the same promise — believers receive Spirit baptism after water baptism in Jesus' name.

1 Corinthians 12:13 describes Spirit baptism as uniting all believers into Christ's body — the reality John promised.

Matthew 3:6 shows the water baptism John administered, the same practice he contrasts with Spirit baptism in Mark 1:8.

Luke 3:16 is the parallel saying, adding 'and fire' to the promise of Spirit baptism.

John 1:26 gives another version of John's statement about water baptism and the coming one.

John 1:33 reveals God's instruction about the Spirit baptism, providing backstory to Mark 1:8.