Reference for Zevachim 235:7

אמר מר רבי שמעון אומר וכו': מ"ט דרבי שמעון דכתיב (יהושע ה, י) ויעשו בני ישראל את הפסח בגלגל

Now that is obvious?<span class="x" onmousemove="('comment',' That they had to sacrifice the Passover-offering: why then does Scripture state it?');">¹⁰</span> Surely then this is what [the text] informs us: they offered only obligatory [sacrifices] similar to the Passover-offering,<span class="x" onmousemove="('comment',' I.e., those which must be offered at a fixed time.');">¹¹</span>

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