Reference for Pesachim 230:3

אמרוה רבנן קמיה דרב פפא הא בעלמא איתמר דאי סלקא דעתך הכא איתמר למה לי נטילת ידים תרי זימני הא משא ליה ידיה חדא זימנא

R'Papa also said: A man must not keep the bitter herbs [an appreciable time] in the haroseth, because the sweetness of its ingredients [sc. the haroseth] my neutralize its bitterness, whereas the taste of bitter herbs essential, but it is then absent. R'Hisda brought<span class="x" onmousemove="('comment',' .');">⁵</span> Rabbana 'Ukba<span class="x" onmousemove="('comment',' 'Rabbana' is a Babylonian title, probably the equivalent of the Palestinian 'Rabban' lit., 'our teacher,' which is a peculiar title of honour, higher than 'Rabbi.'');">⁶</span>

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