Final answer:
Matthew provides a reason for Jesus's baptism to fulfill all righteousness.
Step-by-step explanation:
Unlike Mark, Matthew provides a reason for Jesus's baptism.
In the Gospel of Matthew, the reason given for Jesus's baptism is to fulfill all righteousness. Jesus explains to John the Baptist that it is necessary for him to be baptized in order to fulfill God's plan. This act of obedience is an example for all his followers to follow.
So, in summary, Matthew provides a reason for Jesus's baptism to fulfill all righteousness.