Luke 5:35

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

Luke 17:22

And he said to his disciples: The days will come, when you will desire to see one of the days of the Son of man, and shall not see it.

Matthew 6:17-18

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

Luke 24:17-21

And he said to them: What matters are these which you are discussing with one another as you walk and are sad?

John 12:8

For the poor you have always with you; but me you have not always.

John 13:33

Little children, yet a little while I am with you. You will seek me, and, as I said to the Jews, whither I go, you can not come, so now I say to you.

John 14:3-4

And if I go and prepare a place for you, I will come again and take you with myself, that where I am, you may be also.

John 16:4-7

But these things I have told you, that, when the time has come, you may remember that I told you of them. But these things I did not tell you at the beginning, because I was with you.

John 16:16-22

A little while, and you will not see me; and again, a little while, and you will see me, be cause I go to the Father.

John 16:28

I came forth from the Father, and have come into the world: again I leave the world, and go to the Father.

John 17:11-13

And I am no longer in the world; but these are in the world, and I come to thee. Holy Father, keep in thy name those whom thou hast given me, that they may be one, as we are one.

Acts 1:9

And when he had spoken these things, while they were looking on him, he was taken up, and a cloud received him out of their sight.

Acts 3:21

whom heaven must retain, till the time for restoring all things that God has spoken by the mouth of his holy prophets of ancient times.

Acts 13:2-3

And while they were ministering to the Lord, and fasting, the Holy Spirit said: Set apart for me Barnabas and Saul, to the work to which I have called them.

Acts 14:23

And when they had appointed elders for them in every church, with prayer and fasting, they commended them to the Lord, on whom they believed.

1 Corinthians 7:5

Debar not one another, unless by agreement for a time, that you may have leisure for prayer; and come together again, lest Satan tempt you through your incontinence.

2 Corinthians 11:27

in weariness and in toil, in watchings often, in hunger and thirst, in fastings often, in cold and nakedness:

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 do you, when you fast, anoint your head and wash your face;
Acts 13:2
And while they were ministering to the Lord, and fasting, the Holy Spirit said: Set apart for me Barnabas and Saul, to the work to which I have called them.
Acts 14:23
And when they had appointed elders for them in every church, with prayer and fasting, they commended them to the Lord, on whom they believed.
1 Corinthians 7:5
Debar not one another, unless by agreement for a time, that you may have leisure for prayer; and come together again, lest Satan tempt you through your incontinence.
2 Corinthians 11:27
in weariness and in toil, in watchings often, in hunger and thirst, in fastings often, in cold and nakedness: