The Scriptural record: The Twelve Apostles were baptized by John the baptist before they were yet called by Jesus and had first believed in Him. They hadn't even been introduced to the Lamb of God! Their's was a pre-faith baptism and their only baptism. Without a doubt, that one-time baptism, by God's grace, was effectual unto their salvation. Their subsequent faith in Jesus confirmed the sign and seal of their baptism under John, which flowed from God's sovereign and wholly gracious election in Christ. They didn't choose Jesus and then announce their choice via baptism. They were baptized... and Jesus Christ their Savior, having already chosen them, called them to Himself (John 15:16; Eph. 1:4).