Mark 13:7

But when you hear of wars and rumors of war, stop getting alarmed. They have to come, but the end is not yet.

Matthew 18:7

A curse on the world for such influences to do wrong! For they must come, but a curse on the man from whom these influences come!

Matthew 24:6-7

You are going to hear of wars and rumors of wars; take care not to be scared out of your wits. They have to come, but that is not the end yet.

Luke 21:9-11

And when you hear of wars and tumults, never be panic-stricken. For this has to take place first, but the end will not come all at once."

John 14:1

"Stop letting your hearts be troubled; keep on believing in God, and also in me.

John 14:27

I now leave you the blessing of peace, I give you the blessing of my own peace. I myself do not give it in the way the world gives it. Stop letting your hearts be troubled or timid.

Acts 17:3

explaining them and proving that the Christ had to suffer and rise from the dead, and said, "This very Jesus whom I proclaim to you is the Christ."

Treasury of Scripture Knowledge

Summary

And when ye shall hear of wars and rumours of wars, be ye not troubled: for such things must needs be; but the end shall not be yet.

Bible References

When

Matthew 24:6
You are going to hear of wars and rumors of wars; take care not to be scared out of your wits. They have to come, but that is not the end yet.
Luke 21:9
And when you hear of wars and tumults, never be panic-stricken. For this has to take place first, but the end will not come all at once."
John 14:1
"Stop letting your hearts be troubled; keep on believing in God, and also in me.

Must

Matthew 18:7
A curse on the world for such influences to do wrong! For they must come, but a curse on the man from whom these influences come!
Acts 17:3
explaining them and proving that the Christ had to suffer and rise from the dead, and said, "This very Jesus whom I proclaim to you is the Christ."