In the **Gemara Berachos** on folio 61a, the sages offer a directive regarding the boundaries of modesty and the preservation of one's spiritual standing. The text teaches that an individual should not walk behind a woman, specifically noting that one who follows a woman by a river forfeits their portion in the World to Come. This severe warning highlights the gravity with which the sages viewed the potential for moral compromise in such settings.
The commentary of **Tosafos** provides a critical clarification to ensure this ruling is understood with precision. The commentators explain that this loss of one's spiritual portion does not apply to someone who happens to see a woman by the river in a single instance or who is not otherwise accustomed to such behavior. Rather, the ruling specifically targets an individual who has made a habit of this practice. The reasoning provided is that when a person is accustomed to such conduct, it inevitably leads to immorality, which ultimately causes them to descend into **Gehennom**. By making this distinction, the law focuses on the danger of habitual behavior and the long-term spiritual trajectory it creates, rather than an isolated or accidental occurrence.