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Rebaptism should be conducted in the following cases:
1-When a person receives more light.
“They said unto him, we have not so much as heard whether there be any Holy Ghost. And he said unto them, Unto what then were ye baptized? And they said, Unto John’s baptism. Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe on him which should come after him, that is, on Christ Jesus. When they heard this, they were baptized in the name of the Lord Jesus” (Acts 19:2-5).
2-If a person backslides then comes back to the Lord.
When a person abandons his Christian experience then repents and comes back to the Lord, he should be re-baptized to start a new life with the Lord (Acts 2:38; Acts 19:4).
3-If a person was baptized in a non-biblical method.
Baptism by immersion is the only biblical method of baptism that adequately illustrates what baptism symbolizes—believers dying, being buried with Christ, and being raised to newness of life (Romans 6:3-4). If the method of baptism was sprinkling or pouring, then it does not match the definition of baptism for, the word baptize means “to submerge in water.”
4-If a person was baptized as an infant.
An infant can’t mentally learn of God’s plan of salvation, believe in the Lord as a personal Savior nor repent of his sins. Therefore, re-baptism for an adult in this case is necessary.
In His service,