Reference for Pesachim 77:12

ואימא הרזיפו דומיא דמצה מה מצה שניקחת בכסף מעשר אף מרור שניקח בכסף מעשר

Said he to him, What is [in] your mind: that it is more bitter? But we learned H A Z E R E T H; and the School of Samuel taught, Hazereth; while R'Oshaia said: The obligation is properly [fulfilled with] hazereth. And Raba said: What is hazereth?

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