As we are talking about fascinating peshatim, there is a fascinating Ramban this parasha on וחי בהם. He says that the rewards are provided according to the purpose for doing mitzvos. If someone does mitzvos to gain olam hazeh, he will be rewarded accordingly. If he does mitzvos for olam habo, his rewards will be set aside for olam habo. If he does mitzvos for itself, he will gain both worlds.
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