“All the people

Were baptized.”

Ἐγένετο δὲ ἐν τῷ βαπτισθῆναι ἅπαντα τὸν λαὸν

Mark, chapter 1:5, and Matthew, chapter 3:5-6, spoke about all the people coming out to be baptized by John the Baptist.  Matthew, like Mark, mentioned that all the people from Jerusalem and the Judean area were going out to see John the Baptist.  However, Matthew also added that the people from along the Jordan River, a little further north, were also coming out to see him.  Mark said that all the people from the whole Judea countryside or region as well as all the people of Jerusalem were going out to see John   Perhaps not all the people of Judea and Jerusalem went out to be baptized by John.  Luke here, on the other hand, gave no geographical indications.  He simply generically stated that all the people were baptized (Ἐγένετο δὲ ἐν τῷ βαπτισθῆναι ἅπαντα τὸν λαὸν).  Once again, “all” might be an exaggeration.  John baptized these people in the Jordan River, while they were confessing their sins.  The Jordan River is north of the Dead Sea and Jerusalem.  Jewish baptisms were not that uncommon.  Washing was a physical and spiritual cleansing for sins, as people were unclean or dirty.  Thus, in the process of this spiritual cleansing, they would confess their sins.  John’s baptism had a few unique qualities, since it was a moral statement with an expectation of a coming Messiah or savior.  Clearly, John held a central role in the gospels of Mark and Luke, since they started their stories about Jesus with John.