Luke 2:35
"(Yea, a sword shall pierce through thy own soul also,) that the thoughts of many hearts may be revealed."
Cross References (ranked by relevance)
1 Corinthians 11:19
For there must be also heresies among you, that they which are approved may be made manifest among you.
Deuteronomy 8:2
And thou shalt remember all the way which the LORD thy God led thee these forty years in the wilderness, to humble thee, and to prove thee, to know what was in thine heart, whether thou wouldest keep his commandments, or no.
John 19:25
Now there stood by the cross of Jesus his mother, and his mother’s sister, Mary the wife of Cleophas, and Mary Magdalene.
Psalm 42:10
As with a sword in my bones, mine enemies reproach me; while they say daily unto me, Where is thy God?