'Fast' in the Bible

And John's disciples and the Pharisees were fasting, and they came and said to him, "{Why} do the disciples of John and the disciples of the Pharisees fast, but your disciples do not fast?"

And Jesus said to them, "The {bridegroom's attendants} are not able to fast while the bridegroom is with them, [are they]? As long a time [as] they have the bridegroom with them, they are not able to fast.

But days will come when the bridegroom is taken away from them, and then they will fast in that day.

(For the Pharisees and all the Jews do not eat unless they wash their hands {ritually}, [thus] holding fast to the traditions of the elders.

And [when they come] from the marketplace, they do not eat unless they wash. And there are many other [traditions] which they have received [and] hold fast to--[for example,] the washing of cups and pitchers and bronze kettles and dining couches.)

Abandoning the commandment of God, you hold fast to the tradition of men."