Mark 13:7

But when you hear of wars and rumors of wars, be not troubled; for these things must be: but not yet is the end.

Matthew 18:7

Alas for the world because of snares! for it is necessary that snares come: but alas for that man by whom the snare comes!

Matthew 24:6-7

And you will hear of wars and rumors of wars: see that you be not troubled, for all things must be fulfilled; but the end is not yet.

Luke 21:9-11

But when you hear of wars, and tumults, be not terrified; for these things must first take place; but the end comes not immediately.

John 14:1

Let not your heart be troubled; believe in God; believe also in me.

John 14:27

Peace I leave to you; my peace I give to you; not as the world gives, do I give to you. Let not your heart be troubled, and let it not be afraid.

Acts 17:3

explaining and affirming that it was necessary for the Christ to suffer and to rise from the dead; and that this Jesus whom I preach 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 you will hear of wars and rumors of wars: see that you be not troubled, for all things must be fulfilled; but the end is not yet.
Luke 21:9
But when you hear of wars, and tumults, be not terrified; for these things must first take place; but the end comes not immediately.
John 14:1
Let not your heart be troubled; believe in God; believe also in me.

Must

Matthew 18:7
Alas for the world because of snares! for it is necessary that snares come: but alas for that man by whom the snare comes!
Acts 17:3
explaining and affirming that it was necessary for the Christ to suffer and to rise from the dead; and that this Jesus whom I preach to you is the Christ.