A.T. Robertson Commentary Matthew 15:5

"But ye say, whosoever shall say to his father or his mother, That wherewith thou mightest have been profited by me is given [to God];" — Matthew 15:5 (ASV)

But ye say (υμεις δε λεγετε). In sharp contrast to the command of God. Jesus had quoted the fifth commandment (Exodus 20:12,16) with the penalty "die the death" (θανατω τελευτατω), "go on to his end by death," in imitation of the Hebrew idiom. They dodged this command of God about the penalty for dishonouring one's father or mother by the use "Corban" (κορβαν) as Mark calls it . All one had to do to evade one's duty to father or mother was to say "Corban" or "Gift" (Δωρον) with the idea of using the money for God. By an angry oath of refusal to help one's parents, the oath or vow was binding. By this magic word one set himself free (ου μη τιμησε, he shall not honour) from obedience to the fifth commandment. Sometimes unfilial sons paid graft to the rabbinical legalists for such dodges. Were some of these very faultfinders guilty?