(1) Those who directly received the calling by Christ to spread the gospel of the water and the Spirit (Mark 3:13; Luke 6:13; Galatians 1:1).
(2) Those who lived with Christ and witnessed His works on earth. The disciples of Jesus Christ were witnesses to the fulfillment of the righteousness of God through Christ’s life (Acts 1:21-22; 1 Corinthians 9:1). 
(3) Those who, being filled by the Holy Spirit, received the power to fulfill the works commanded by Christ (Acts 15:28; 1 Corinthians 2:13; 1 Thessalonians 4:8; 1 John 5:9-12).
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