Reference for Shabbat 121:5

ואזדא רבי יוחנן לטעמיה דאמר ר' יוחנן כתפילין כך מנעלין מה תפילין בשמאל אף מנעלין בשמאל

Said Abaye to him: But perhaps R. Johanan did not hear this Baraitha, but if he had heard it, he would have retracted? Or perhaps he heard it and held that the <i>halachah</i> is not as that Mishnah?<span class="x" onmousemove="('comment',' It is really a Baraitha, not a Mishnah. ');">⁵</span>

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