Mark 13:7

But when you hear of wars and rumours of wars, do not be alarmed: come they must, but the End is not yet.

Matthew 18:7

"Alas for the world because of causes of falling! They cannot but come, but alas for each man through whom they come!

Matthew 24:6-7

And before long you will hear of wars and rumours of wars. Do not be alarmed, for such things must be; but the End is not yet.

Luke 21:9-11

But when you hear of wars and turmoils, be not afraid; for these things must happen first, but the end does not come immediately."

John 14:1

"Let not your hearts be troubled. Trust in God: trust in me also.

John 14:27

Peace I leave with you: my own peace I give to you. It is not as the world gives its greetings that I give you peace. Let not your hearts be troubled or dismayed.

Acts 17:3

which he clearly explained, pointing out that it had been necessary for the Christ to suffer and rise again from the dead, and insisting, "The Jesus whom I am announcing 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
And before long you will hear of wars and rumours of wars. Do not be alarmed, for such things must be; but the End is not yet.
Luke 21:9
But when you hear of wars and turmoils, be not afraid; for these things must happen first, but the end does not come immediately."
John 14:1
"Let not your hearts be troubled. Trust in God: trust in me also.

Must

Matthew 18:7
"Alas for the world because of causes of falling! They cannot but come, but alas for each man through whom they come!
Acts 17:3
which he clearly explained, pointing out that it had been necessary for the Christ to suffer and rise again from the dead, and insisting, "The Jesus whom I am announcing to you is the Christ."