Mark 4:40

And he said to them: Why are you so fearful? How is it that you have no faith?

Mark 5:36

But as soon as Jesus heard what was spoken, he said to the ruler of the synagogue: Fear not, only believe.

Treasury of Scripture Knowledge

Summary

And Isaiah said unto them, Thus shall ye say unto your master, Thus saith the LORD, Be not afraid of the words that thou hast heard, wherewith the servants of the king of Assyria have blasphemed me.

Bible References

Be not

Mark 4:40
And he said to them: Why are you so fearful? How is it that you have no faith?
Mark 5:36
But as soon as Jesus heard what was spoken, he said to the ruler of the synagogue: Fear not, only believe.