Kabbalah su Salmi 15:4

One of the things that one should be careful about if he does not want them to defile him, is if he made a promise he must fulfill the promise for the work of Hashem, as it says “who keeps an oath even when it hurts, and does not change their mind” (Psalms 15:4). If he does not fulfill the Mitzva and broke his promise he is able to be defiled, as it says “Do not let your mouth to lead you to sin” (Ecclesiastes 5:5), and in the Midrash it explains that it means about Nedarim (promises). And as it says in the Zohar in the Prologue: 138. Therefore, every person should be careful not to say what King David said, because he will not be able to say to THE ANGEL Dumah, “it was an error” (Kohelet 5:5), as it was with David. Because in David’s case, the Holy One, blessed be He, defeated (Dumah) in the case. “Wherefore should Elohim be angry at your voice” (Ibid.) refers to the voice that said, “and destroy the work of your hands” (Ibid.). This is the sacred flesh, WHICH IS the holy covenant that he damaged, and because of which he is to be dragged down to Gehenom by the angel Dumah.