Ruth 4:12

"And let thy house be like the house of Perez, whom Tamar bare unto Judah, of the seed which Jehovah shall give thee of this young woman."

It first appears that this mention of Judah's shameful action in begetting Perez of Tamar might have been inappropriate, but the significance of it lies, perhaps, in the fact of Tamar's having been a foreigner (a Canaanite), a non-Israelite, just like Ruth the Moabitess. Tamar and Ruth are both mentioned in the genealogy of Christ in the N.T. (Matthew 1:3,5), thus the blessing of the elders that day was fully realized in time.