How can God give the 'fruits' of certain mitzvot in this world and preserve the principal for the World to Come without it being considered interest?

This source-based Torah study examines the question: How can God give the 'fruits' of certain mitzvot in this world and preserve the principal for the World to Come without it being considered interest? The canonical Hebrew discussion develops the issue through the weekly Torah portion and the classical sources cited there, preserving the distinctions and tensions of the original unit. This localized layer is a discovery-oriented summary rather than a full translation of the article, and it does not add a new halakhic, medical, legal, historical, mystical or empirical ruling or claim beyond the canonical source. Any practical conclusion remains subject to the unit’s canonical review status.