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Jesus, before His ascension, told His disciples that His Father would send the Comforter – The Holy Spirit – who would teach and guide all those who believe in Him (John 14:26; 16:7). This promise of Jesus was fulfilled when the Holy Spirit came with power on believers at Pentecost (Acts 2). Now, when a person believes in Christ, the Holy Spirit immediately becomes a part of his life (Romans 8:14; 1 Corinthians 12:13).