Seeking a source for a disprovable assertion about the Torah

I have often heard it said, but without a source, that "there are only two mitzvot for which the Torah specifies a reward: honor your parents and send away the mother bird before gathering her eggs." I'd like to track this back to an original source, if I can. Here's why:

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Seeking a source for a disprovable assertion about the Torah

I have often heard it said, but without a source, that "there are only two mitzvot for which the Torah specifies a reward: honor your parents and send away the mother bird before gathering her eggs." I'd like to track this back to an original source, if I can. Here's why:

( Cut for length )