“Repent and be baptized“.
Acts 2:41 “Those who accepted his message were baptized, and about three thousand were added to their number that day.“
Acts 8:12 “But when they believed Philip as he preached the good news of the kingdom of God and the name of Jesus Christ, they were baptized, both men and women.“
Acts 8:37, 38 “Philip said, “If you believe with all your heart, you may.” The eunuch answered, “I believe that Jesus Christ is the Son of God.” And he gave orders to stop the chariot. Then both Philip and the eunuch went down into the water and Philip baptized him."
Acts 16:13-15 “On the Sabbath we went outside the city gate to the river, where we expected to find a place of prayer. We sat down and began to speak to the women who had gathered there. One of those listening was a woman named Lydia, a dealer in purple cloth from the city of Thyatira, who was a worshiper of God. The Lord opened her heart to respond to Paul’s message. When she and the members of her household were baptized, she invited us to her home. “If you consider me a believer in the Lord,” she said, “come and stay at my house.” And she persuaded us.“
Acts 16:30-33 “He then brought them out and asked, “Sirs, what must I do to be saved?” They replied, “Believe in the Lord Jesus, and you will be saved,you and your household.” Then they spoke the word of the Lord to him and to all the others in his house. At that hour of the night the jailer took them and washed their wounds; then immediately he and all his family were baptized."
Acts 18:8 “Crispus, the synagogue ruler, and his entire household believed in the Lord; and many of the Corinthians who heard him believed and were baptized.“
Water baptism is thus intended for believers. Baptism must be preceded by a profession of faith.