The portion of "Rashei Hamatot"

And Moses spoke to the heads of the tribes of the children of Israel, saying, "Take vengeance for the children of Israel against the Midianites; afterward you shall be gathered to your people."

However, the benefits derived from this portion are twofold.

The first benefit is regarding the commandments, which entail that one should not violate their vows or break their oaths. Instead, they should fulfill everything that comes from their mouth. In this, there are two commandments: one is a negative commandment, prohibiting the violation of vows, and the other is a positive commandment, instructing the fulfillment of one's verbal commitments. The benefit of these commandments is evident, as if it were permissible for a person to profane their words, it would lead to a laxity in their faith in the Almighty. This is similar to the rationale behind the prohibition of false oaths, as it prevents the distortion of the ethical principles that guide human interactions. Moreover, there is an additional benefit, as through these commandments, a person is encouraged to exert more effort in performing good deeds. If one were to annul their own vows, the benefit of these actions would be diminished.

The second benefit is related to the commandments and pertains to the legal proceedings concerning the annulment of vows. This applies to cases involving a man and his wife, a father and his daughter during her youth, or the household of her father. The benefit of this commandment is evident, as without it, there would be constant discord and conflict between husbands and wives or fathers and daughters due to the binding nature of vows and oaths. Women, due to their more sensitive nature, are particularly prone to being affected by these vows and oaths. Therefore, the Torah provided a solution to address this potential discord by allowing for the annulment of vows within a certain timeframe. This allows the husband or father to reconsider the matter and, if it is a source of anger or conflict, the annulment can be performed promptly. This gives the opportunity for the anger to subside and for a resolution to be reached within a day, based on the customary practices of most people.