Matthew's Narrative in Verse 16

Matthew is basically following Mark's narrative with minor changes. But now look what he inserts in verses 16 and following. Behold, I send you out as sheep in the midst of wolves, so be wise as serpents and innocent as doves. Beware of men, for they will deliver you up to councils and flog you in their synagogues. You will be dragged before governors and kings for my sake"