What is CORBAN?
Question: What is the practice of Corban that Jesus condemned in the Bible?
Answer: Mark 7 is the only place in the Bible where Jesus makes comments regarding the issue of Corban. His comments are a response to some self-righteous religious leaders who criticized his disciples for failing to wash, ceremonially, their hands before eating. After condemning them for their hypocrisy and "clever" methods of nullifying the laws of God so that they can keep their "cherished" traditions, he says the following.
Jesus was condemning the general practice of the Pharisees of bypassing God's laws and substituting them with their own traditions through Corban. The case you cite is one of the many Jesus was denouncing.
The Treasury of Scriptural Knowledge says that this practice was common among the Jews. The Pharisees would release by their own power a child from supporting his parents. Amazingly, according to the TSK, these religious leaders would deem it sacrilege if such a person afterwards decided to go ahead and support those who gave birth to him.
Easton's Bible Dictionary goes further on to state that this practice was considered a temple offering set aside or dedicated to God. A person could not reclaim anything given this designation. The dictionary also states that Jesus hated this practice of the Pharisees, as their traditions in this area nullified God's commandment that children should honor their parents. Their teaching gave people an excuse for not helping their father or mother and at the same time offered them the opportunity to use such designated good for their own selfish use.
God has instituted the fifth commandment for the explicit purpose of honoring one's parents (Exodus 20:12). Unfortunately, human beings have consistently tampered with God's instructions and this is one case. One of the ways to honor parents is by giving them financial support when in need, especially when they are in old age. Children were obliged to adhere to the law whether they loved their parents or not. However, with the permission of the Pharisees, they could circumvent part of the law by dedicating money meant for the parents to the temple. This is one example of how God's laws were made "of no effect" and overridden by religious tradition.