Mark 13:7

And, when you hear of wars and rumors of wars, do not be alarmed; such things must occur; but the end is not yet.

Matthew 18:7

Alas for the world because of such snares! There cannot but be snares; yet alas for the man who is answerable for the snare!

Matthew 24:6-7

And you will hear of wars and rumors of wars; take care not to be alarmed, for such things must occur; but the end is not yet here.

Luke 21:9-11

And, when you hear of wars and disturbances, do not be terrified, for these things must occur first; but the end will not be at once."

John 14:1

Do not let your hearts be troubled. Believe in God; believe also in me.

John 14:27

Peace be with you! My own peace I give you. I do not give to you as the world gives. Do not let your hearts be troubled, or dismayed.

Acts 17:3

He laid before them and explained that the Christ must undergo suffering and rise from the dead; and "It is this man," he declared, "who is the Christ--this Jesus about whom I am telling 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 you will hear of wars and rumors of wars; take care not to be alarmed, for such things must occur; but the end is not yet here.
Luke 21:9
And, when you hear of wars and disturbances, do not be terrified, for these things must occur first; but the end will not be at once."
John 14:1
Do not let your hearts be troubled. Believe in God; believe also in me.

Must

Matthew 18:7
Alas for the world because of such snares! There cannot but be snares; yet alas for the man who is answerable for the snare!
Acts 17:3
He laid before them and explained that the Christ must undergo suffering and rise from the dead; and "It is this man," he declared, "who is the Christ--this Jesus about whom I am telling you."