1 Then the scribes and Pharisees who were from Jerusalem came to Jesus, saying, 2 “Why do Your disciples transgress the tradition of the elders? For they do not wash their hands when they eat bread.” 3 He answered and said to them, “Why do you also transgress the commandment of God because of your tradition? 4 For God commanded, saying, ‘Honor your father and your mother’; and, ‘He who curses father or mother, let him be put to death.’ 5 But you say, ‘Whoever says to his father or mother, “Whatever profit you might have received from me is a gift to God”— 6 then he need not honor his father or mother.’ Thus you have made the commandment of God of no effect by your tradition.”
“The sanction of this law in the fifth commandment, is, a promise, that thy days may be long; but our Saviour waives that, lest any should thence infer it to be only a thing commendable and profitable, and insists upon the penalty annexed to the breach of this commandment in another scripture, which denotes the duty to be highly and indispensably necessary; He that curseth father or mother, let him die the death: this law we have, Exod. xxi. 17. The sin of cursing parents is here opposed to the duty of honouring them. Those who speak ill of their parents, or wish ill to them, who mock at them, or give them taunting and opprobrious language, break this law. If to call a brother Raca be so penal, what is it to call a father so? By our Saviour’s application of this law, it appears, that denying service or relief to parents is included in cursing them. Though the language be respectful enough, and nothing abusive in it, yet what will that avail, if the deeds be not agreeable? it is but like him that said, I go, Sir, and went not, ch. xxi. 30.”
—from Matthew Henry’s Commentary on Matthew chapter 15…Find it here.