Reference for Makkot 29:13

א"ל רב פפא לרבא והא לא דמי לאויה ללאו דחסימה א"ל משום דכתב ביה רחמנא עשה יתירא מגרע גרע

Rav Pappa said to Rava But [a lo saseh sh'kedmu asseh] is not similar to the prohibition of muzzling, [so how can Rebbi Yochanon rule that one receives malkus]? Rava answered him, Just because the Torah writes by it an additional commandment, does that make it any less stringent?!

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