At that time Jesus went through the grainfields on the Sabbath. His disciples were hungry, and they began to pluck heads of grain and to eat.  But when the Pharisees saw it, they said to him, “Look, your disciples are doing what is not lawful to do on the Sabbath.”  He said to them, “Have you not read what David did when he was hungry, and those who were with him:  how he entered the house of God and ate the bread of the Presence, which it was not lawful for him to eat nor for those who were with him, but only for the priests?  Or have you not read in the Law how on the Sabbath the priests in the temple profane the Sabbath and are guiltless?
– Matthew 12:1-5
As Jesus walks with His disciples, the Pharisees are suddenly and deeply offended. Jesus’s disciples are breaking the Sabbath. Sabbath-keeping is the fourth commandment. Exodus 20 is clear.
 “Remember the Sabbath day, to keep it holy.  Six days you shall labor, and do all your work,  but the seventh day is a Sabbath to the LORD your God. On it you shall not do any work…
In the Old Testament, breaking Sabbath was punishable by death. So to avoid breaking Sabbath, the Pharisees had many rules. There were rules about how far you could walk, how many letters you could write, and so on and so forth. Eventually, they began to think that they had a complete set of rules regarding the Sabbath. They had figured out Sabbath-keeping.
But then in v. 3-5, Jesus bursts their bubble. Jesus is speaking to Bible scholars who had most of the Old Testament memorized, and He is playing them when He asks, “Have you not read?”
See, the Pharisees felt that they had figured out faith, that they had even figured out God. They were arrogant and so they stopped listening. We too can imagine that we have many things figured out.
We have relationships figured out. We have parenting figured out. We have finances figured out. We have our list of needs figured out. We have the future figured out. And when we believe this, not even God can tell us we are wrong.
When was the last time God told us that we are wrong about something very important? Are we still listening?