Mark 13:7

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

Matthew 18:7

Woe to the world because of offenses! For offenses must necessarily come, but woe to that man by whom the offense comes!

Matthew 24:6-7

And you shall hear of wars and rumors of wars; see that you be not terrified, for all things must be accomplished; but the end is not yet.

Luke 21:9-11

And when you hear of wars and insurrections, be not terrified, for these things must be first; but the end is not immediately.

John 14:1

Let not your hearts be troubled; believe in God and believe in me.

John 14:27

Peace I leave with you; my peace I give you; not as the world gives give I to you. Let not your hearts be troubled, neither let them be afraid.

Acts 17:3

explaining and asserting that the Christ ought 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 shall hear of wars and rumors of wars; see that you be not terrified, for all things must be accomplished; but the end is not yet.
Luke 21:9
And when you hear of wars and insurrections, be not terrified, for these things must be first; but the end is not immediately.
John 14:1
Let not your hearts be troubled; believe in God and believe in me.

Must

Matthew 18:7
Woe to the world because of offenses! For offenses must necessarily come, but woe to that man by whom the offense comes!
Acts 17:3
explaining and asserting that the Christ ought to suffer and to rise from the dead; and that this Jesus whom I preach to you is the Christ.