Mark 13:7

And when ye hear of wars, and rumors of wars, be not troubled; for such things must happen; but the end will not be yet.

Matthew 18:7

Wo will be to the world from such offenses; for it is of necessity that offenses come: but wo to that man by whom the offense cometh.

Matthew 24:6-7

And ye shall hear of wars and rumors of wars, but be not troubled; for all these must indeed come to pass, but the end is not yet.

Luke 21:9-11

And when ye shall hear of wars and commotions, be not terrified: for these must first happen; but the end will not be directly.

John 14:1

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

John 14:27

Peace I leave with you, my peace I give unto you; not as the world giveth, do I give unto you. Let not your heart be troubled, neither let it be afraid.

Acts 17:3

opening them and shewing, that the Messiah was to suffer and rise again from the dead: and that this is the Christ even, Jesus, whom, said he, I preach unto you.

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 ye shall hear of wars and rumors of wars, but be not troubled; for all these must indeed come to pass, but the end is not yet.
Luke 21:9
And when ye shall hear of wars and commotions, be not terrified: for these must first happen; but the end will not be directly.
John 14:1
Let not your heart be troubled: believe in God, believe also in me.

Must

Matthew 18:7
Wo will be to the world from such offenses; for it is of necessity that offenses come: but wo to that man by whom the offense cometh.
Acts 17:3
opening them and shewing, that the Messiah was to suffer and rise again from the dead: and that this is the Christ even, Jesus, whom, said he, I preach unto you.