How do we know baptism is necessary for believers?

Baptism is necessary for believers as it is a direct command from Christ. In Matthew 28:19, Jesus instructed His disciples to 'go ye therefore and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost.' This shows that baptism is part of the believer's commitment to the faith. Furthermore, Acts 2:38 indicates that repentance and baptism are closely linked, emphasizing that baptism publicly expresses one's belief in Jesus. It is both an act of obedience and a vital part of the believer's confession of faith.