Reference for Pesachim 172:2

במאי קמיפלגי רבי יהודה סבר יש אם למסורת ור' שמעון סבר יש אם למקרא

Wherein do they differ? R'Judah holds: The traditional [non-vocalized] text is authoritative; while R'Simeon holds: The text as read [as vocalized] is authoritative.<span class="x" onmousemove="('comment',' V. n. 1; also Sanh., Sonc. ed. p. 10, n. 4.');">²</span>

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