Pharisees and scribes fasted each Monday and Thursday in a demonstrative manner. They whitened their faces and sprinkled ashes on their heads. But Jesus' disciples did not fast, because, in the words of Christ, "can the wedding guests fast while the bridegroom is with them? As long as they have the bridegroom with them, they cannot fast. The days will come when the bridegroom is taken away from them, and then they will fast in those days." (Mark 2:19-20).
The Jews also demonstratively observed the commandment of keeping the Sabbath. That is why they reproached the disciples of Christ for plucking ears of corn on Saturday but received Christ's following answer: "The Sabbath was made for man, not man for the Sabbath" (Mark 2:27).