Genesis 38

"Then Judah said to Tamar his daughter-in-law, “Remain a widow in your father’s house till my son Shelah is grown.” For he said, “Lest he also die like his brothers.” And Tamar went and dwelt in her father’s house...So Judah acknowledged them and said, “She has been more righteous than I, because I did not give her to Shelah my son.” And he never knew her again." vv.11,26

Read chapter 38.
Tamar was a Canaanite and was not a nation that Israel was suppose to mix with, yet Judah goes and not only seeks and makes friends with them but takes one to be his wife and then his son's wives.  Judah seems to make it Tamar's fault that his sons died when it was the Lord's anger and judgment towards them for their cause of death.  God has compassion on Tamar for Judah's sins, and despite playing the harlot and sleeping with her father-in-law, this ultimately played the role to the lineage of Jesus Christ.  "Judah, one of the heirs of the everlasting covenant with the Living God, was put to shame by a Canaanite woman" (NKJV study notes).  Tamar showed faith of his promise despite her origins.  God had mercy on Judah and a use for Tamar.  A use a man would never make, but a use by God to bring the Messiah and shame man's ways.  How have you felt shamed by your actions from a non-believer?