"What was the
baptism that Jesus'
disciples did, before John
the Baptist was put into
prison? Was it the same as
John's baptism?"
Since the
Lord Jesus hadn't died and
shed His blood on the cross
for our sins before John the
Baptist was beheaded, my
opinion is that it was the
same as John's baptism of
sinners who were told to
repent.
However,
after Jesus' death on the
cross, and His resurrection,
Peter says the following:
Acts 2:38, "Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the
remission of sins, and ye shall
receive the gift of the Holy Ghost.
Remission of
sins is the absolving of sins
or forgiveness of them.