The baptism of the Holy Ghost is the birth of the Spirit (John 3:5). This spiritual baptism is necessary to put someone into the kingdom of God (God's church, the bride of Christ) and is evidenced by speaking in other tongues (other languages) as the Spirit of God give utterance. It was prophesied by Joel (Joel 2:28-29) and Isaiah (Isaiah 28:11), foretold by John the Baptist (Matthew 3:11), purchased by the blood of Jesus, and promised by Him to His disciples (John 14:26; 15:16). The Holy Ghost was first poured out on the Day of Pentecost upon the Jews (Acts 2:1-4), then upon the Samaritans (Acts 8:17), and later upon the Gentiles (Acts 10:44-46; 19:6). "The promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call" (Acts 2:39). Tongues:  Speaking in other tongues as the Spirit of God gives utterance is the manifestation God has given as the definite, indisputable, supernatural witness or sign of the baptism of the Holy Ghost (Acts 2:4; 10:46; 19:6). It was prophesied by the prophet Isaiah as the rest and the refreshing (Isaiah 28:11-12), foretold by Jesus as a sign that would follow believers of the gospel (Mark 16:17), and experienced by Jews and Gentiles alike.  The gift of "diverse kinds of tongues," mentioned by Paul in I Corinthians 12:1-12 and concerning which he gave regulations in I Corinthians 14:1-40, is given by both for self-edification (I Corinthians 14:4) and for the edification of the church (I Corinthians 14:27-28). In church meetings the gift of tongues is used to give a public message, and it is to be interpreted. Since this gift can be misused in public, it needs proper regulation (I Corinthians 14:23-28). Not all believers exercise the gift of tongues, which is different in function from tongues given by God as the initial witness of the baptism of the Holy Ghost. Paul said, "Forbid not to speak with tongues"(I Corinthians 14:39) and "I thank my God, I speak with tongues more than ye all" (I Corinthians 14:8). Who dares to teach or preach to the contrary?Speaking in tongues means speaking miraculously in a language unknown to the speaker, as the Spirit gives utterance. Tongues can be classified in two ways, according to function: (1)speaking in other tongues as the initial evidence of the baptism of the Holy Ghost and (2)the gift of tongues as mentioned in I Corinthians. Holiness:After we are saved from sin, we are commanded, "Go, and sin no more" (John 8:11). We are commanded to live soberly, righteously, and godly in this present world (Titus 2:12) and warned that without holiness no one shall see the Lord (Hebrews 12:14). We must present ourselves as holy unto God (Romans 12:1), cleanse ourselves from all filthiness of the flesh and spirit (II Corinthians 7:1), and separate ourselves from all worldliness (James 4:4). If the righteous scarcely be saved, where shall the ungodly and the sinner appear? (I Peter 4:18). No one can live a holy life by his own power, but only through the Holy Spirit. "Ye shall receive power, after that the Holy Ghost is come upon you" (Acts 1:8).