Genesis 38:11

For he said, lest he also die. — It is evident from this that Judah, for reasons which, in Genesis 38:26, he acknowledged to be insufficient, wished to evade the duty of giving a third son to Tamar. It does not follow that he blamed her for their deaths; for the loss of two sons in succession might well frighten him. Philippsohn says that it became the rule, that if a woman lost two husbands, the third brother was not bound to marry her, and she was even called Katlannith. the murderess. (But see St. Matthew 22:25, where no such custom is acknowledged.)