Luke 5:35

But the time will come when the groom will be taken away from them [Note: Jesus here refers to Himself]. Then they will fast at that time."

Luke 17:22

Then He said to the disciples, "The time is coming when you will long to see one of the days of the Son of man [i.e., the time when the Messiah would deliver His people from tribulation], but you will not see it [i.e., such deliverance would not occur during their lifetimes].

Matthew 6:17-18

But when you fast, groom your hair and wash your face

Luke 24:17-21

Then Jesus said to them, "What have you been talking about while [you were] walking along together?" And they stopped [suddenly], looking dejected.

John 12:8

For you will always have poor people among you, but you will not always have me."

John 13:33

"I will be with you, [my dear] children, for only a little while [longer]. You people will look for me, but I am now telling you what I told the Jewish authorities, 'You will not be able to go where I will be.'

John 14:3-4

And if I go to prepare a place for each of you, I will return to take all you to [be with] me, so that you also will be where I am.

John 16:4-7

But I have told you these things so that, when the time comes [for people to do such things], you will remember that I had warned you. I did not tell you them at the beginning [of my ministry] because I was with you [i.e., to protect you from persecution].

John 16:16-22

After a little while [longer] you will not see me anymore. Then a little while [later] you will see me again."

John 16:28

I came from the Father into this world and now I am leaving the world and returning to the Father."

John 17:11-13

And [now] I am coming to you, for I will not be in the world any longer, yet these men are [still] in the world. Holy Father, protect them by [the power of] your name which you have given me. May these men be one, as we are.

Acts 1:9

And when Jesus had said these things, just as the apostles were watching [Him], He was taken up by a cloud [and disappeared] out of their sight.

Acts 3:21

who must be received into heaven until [God's appointed] times when everything will be restored [to its intended purpose]. God had spoken about this through the proclamations of His holy prophets of long ago.

Acts 13:2-3

As these men were ministering to the Lord [i.e., this probably means worshiping] and fasting, the Holy Spirit said [to one of them by way of inspiration]: "Set Barnabas and Saul apart for Me, [commissioning them] to do the work for which I have called them."

Acts 14:23

And when Paul and Barnabas had appointed elders [for the churches] in every congregation and had prayed and fasted [over these elders], they committed them to [the care of] the Lord, in whom they had come to trust.

1 Corinthians 7:5

Do not deprive each other [of these marital rights], except by mutual agreement, so that you can spend the time in prayer. Then resume [normal sexual] relations again, so Satan is not able to tempt you [i.e., to have an affair] because of your lack of self-control.

2 Corinthians 11:27

I have worked and suffered. I have often gone without sleep, been hungry and thirsty, often gone without food [i.e., for spiritual reasons], been cold and had inadequate clothing.

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, groom your hair and wash your face
Acts 13:2
As these men were ministering to the Lord [i.e., this probably means worshiping] and fasting, the Holy Spirit said [to one of them by way of inspiration]: "Set Barnabas and Saul apart for Me, [commissioning them] to do the work for which I have called them."
Acts 14:23
And when Paul and Barnabas had appointed elders [for the churches] in every congregation and had prayed and fasted [over these elders], they committed them to [the care of] the Lord, in whom they had come to trust.
1 Corinthians 7:5
Do not deprive each other [of these marital rights], except by mutual agreement, so that you can spend the time in prayer. Then resume [normal sexual] relations again, so Satan is not able to tempt you [i.e., to have an affair] because of your lack of self-control.
2 Corinthians 11:27
I have worked and suffered. I have often gone without sleep, been hungry and thirsty, often gone without food [i.e., for spiritual reasons], been cold and had inadequate clothing.