Reference for Chullin 283:21

זו מחשבת עבודה זרה

- This was what he [R'Jacob] meant to convey: if there is a reward for precepts in this world, then surely that [reward] should have stood him in good stead and guarded him from such thoughts that he come not to any hurt; we must therefore say that there is no reward for precepts in this world.

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