Behar-Bechukotai 5773

The Or Hachaim has 42 interpretations on the first posuk of bechukosai. Interpretation #17 describes a certain situation: A person is going to do a mitzvah but is prevented from doing it. Hashem gives him reward as if he had done the mitzvah. The posuk is read like this: If you are intending to go do a mitzvah but are prevented to do it, it'll be as if you had already done it.