For John the Baptist,.... Who is designed by the children that mourned in the above simile, with whom his character and conduct agree; he preached very mournful doctrine, delivered it in a very solemn and awful manner, and lived a very austere life, and fasted much, as did also his disciples.
The word "Baptist" is here added by Luke, which Matthew has not, to distinguish him from others; and it may be, because he had just spoke of his baptism.