What does the Bible say about baptism of the Holy Spirit?

The Bible describes the baptism of the Holy Spirit as a transformative act of God's grace that regenerates sinners. This regeneration is essential for salvation, marking the new birth wherein a person becomes a new creation in Christ. According to Romans 8:14-16, those who are led by the Spirit of God are the children of God, indicating that the baptism of the Holy Spirit is intertwined with one's identity as an adopted son or daughter of God. The Holy Spirit bears witness with our spirit that we are indeed the children of God, affirming the work God has done in us through regeneration. In Galatians 4:6, we see that God sends the Spirit of His Son into our hearts, causing us to cry out, 'Abba, Father'. This illustrates the personal relationship we now have with God as a result of being baptized with the Holy Spirit.