Luke 5:35

A time will come when the bridegroom is taken from them, and then they will fast at that time."

Luke 17:22

To his disciples he said, "There will come days when you will long and long in vain to have even one day of the Son of man.

Matthew 6:17-18

But when you fast, anoint your head and wash your face,

Luke 24:17-21

He said to them, "What is all this you are debating on your walk?" They stopped, looking downcast,

John 12:8

You have always the poor beside you, but you have not always me."

John 13:33

My dear children, I am only to be with you a little longer; then you will look for me, and, as I told the Jews I tell you now, where I go you cannot come.

John 14:3-4

And when I go and prepare a place for you, I will come back and take you to be with me, so that you may be where I am.

John 16:4-7

I have told you all this, so that when the time for it arrives, you may remember what I said to you. I did not tell you about this at the beginning, because I was with you then;

John 16:16-22

In a little while, you will behold me no longer; then, after a little, you shall see me."

John 16:28

From the Father I came and I entered the world; again, I leave the world and I go to the Father."

John 17:11-13

I am to be in the world no longer, but they are to be in the world; I come to thee. Holy Father, keep them by the power of thy Name which thou hast given me, that they may be one as we are one.

Acts 1:9

On saying this he was lifted up while they looked on, and a cloud took him out of sight.

Acts 3:21

who must be kept in heaven till the period of the great Restoration. Ages ago God spoke of this by the lips of his holy prophets;

Acts 13:2-3

As they were worshipping the Lord and fasting, the holy Spirit said, "Come! set me apart Barnabas and Saul for the work to which I have called them."

Acts 14:23

They chose presbyters for them in every church, and with prayer and fasting entrusted them to the Lord in whom they had believed.

1 Corinthians 7:5

Do not withhold sexual intercourse from one another, unless you agree to do so for a time in order to devote yourselves to prayer. Then come together again. You must not let Satan tempt you through incontinence.

Treasury of Scripture Knowledge

Summary

But the days will come, when the bridegroom shall be taken away from them, and then shall they fast in those days.

Bible References

And

Matthew 6:17
But when you fast, anoint your head and wash your face,
Acts 13:2
As they were worshipping the Lord and fasting, the holy Spirit said, "Come! set me apart Barnabas and Saul for the work to which I have called them."
Acts 14:23
They chose presbyters for them in every church, and with prayer and fasting entrusted them to the Lord in whom they had believed.
1 Corinthians 7:5
Do not withhold sexual intercourse from one another, unless you agree to do so for a time in order to devote yourselves to prayer. Then come together again. You must not let Satan tempt you through incontinence.