And, wouldn't you know it, the Rabbis of old had some pretty interesting ideas!
In Vayikra Rabbah, a collection of rabbinic homilies on the Book of Leviticus, we find a fascinating discussion on how some biblical figures actively fought against their yetzer hara (יֵצֶר הָרַע), the "evil inclination." It's not just about passively resisting; these figures took serious action, including... taking oaths!
Rabbi Yosei points out three individuals in particular: Joseph, David, and Boaz. Each of them, he says, was attacked by their yetzer hara and responded by swearing an oath against it. It's like they were saying, "Enough is enough! I'm drawing a line in the sand."
Let's start with Joseph. Remember the story? Potiphar's wife tries to seduce him, but he refuses. Rabbi Huna, quoting Rabbi Idi, homes in on Joseph's powerful words: "How can I perform this great wickedness [and sin against God]?" (Genesis 39:9). Now, here's the really interesting bit: Rav Huna points out that the verse doesn't just say "sin against the Lord," but "sin against God." The Rabbis interpret this slight difference in wording to mean that Joseph wasn't just worried about sinning; he was actively taking an oath against his own evil inclination, saying, "By God, I will not sin and I will not perform this great wickedness!" It's a powerful declaration of intent.
Next up is David. In I Samuel 26:10, David says, "As the Lord lives, rather, the Lord will strike him." The question is, to whom is David making this oath? Rabbi Yoḥanan and Reish Lakish have differing opinions on the matter. Rabbi Yoḥanan believes that David is swearing to his yetzer hara that he won't harm Saul. Reish Lakish, on the other hand, argues that the oath is directed at Avishai, forbidding him from harming Saul. According to this interpretation, David is warning Avishai, "As the Lord lives, if you touch him, I will mix your blood with his blood!" It's a pretty intense way of saying, "Back off!" And that's why, the text explains, "David said to Avishai: Do not destroy him” (I Samuel 26:9).
Finally, we have Boaz, from the Book of Ruth. Remember that nighttime encounter on the threshing floor? Ruth asks Boaz to redeem her, a vulnerable moment with a lot at stake. In Ruth 3:13, Boaz says, "As the Lord lives, lie until the morning." Now, what's going on here? Rabbi Yudan and Rabbi Ḥama offer their insights. Rabbi Yudan suggests that Boaz's yetzer hara was working overtime that night, whispering temptations in his ear: "You're unmarried, she's unmarried... perfect match!" So, Boaz takes an oath against his evil inclination: "As the Lord lives..." But, Rabbi Yudan continues, to the woman he simply says: “Lie until the morning.” It’s an oath to himself, and a promise to her to act honorably.
Rabbi Ḥanina beautifully sums it up, quoting Proverbs 24:5: “A wise man has might, and a man of knowledge exerts strength.” He connects this verse directly to Boaz, explaining that Boaz's wisdom and knowledge are demonstrated by his ability to overcome his evil inclination with an oath.
What can we take away from these stories? Perhaps it's the idea that battling our inner demons isn't a passive process. It requires conscious effort, even dramatic declarations. These figures recognized the power of their yetzer hara and chose to confront it head-on, using the strength of their convictions and, in these cases, the force of an oath. It's a reminder that we, too, have the power to choose our path, even when temptation knocks.