John Chrysostom
Judah, upon realizing the situation, stated, “She deserves my respect because I did not provide her to Shelah my son. What does it signify that she is more righteous than I? It indicates her innocence, while I stand condemned, acknowledging my wrongdoing, despite no accusations being leveled against me; or more accurately, I possess a strong accuser: the pledge I made to her. He then further excuses his actions toward Tamar, reiterating, “Because I did not give her to Shelah my son.” This may have been due to specific concerns, which I will explain. Judah believed that Tamar was responsible for the untimely deaths of his sons, Er and Onan, and out of fear for Silom, he refrained from giving her to him, despite his earlier promise.
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He needed to learn through experience that she was not the cause of his children's demise, but rather that they suffered due to their own wickedness, as it is written, “The Lord slew him” and again of the other son, “slew him also.” Thus, he, in ignorance, became involved with his daughter-in-law, and through this act, he came to realize that it was not her fault but his own unrighteousness that led to his sons’ punishment. Once Judah recognized his sin and absolved Tamar of blame, it is noted that he “knew her no more,” indicating that if he had understood her true character, he would not have engaged with her in the first place.