Reference for Temurah 26:19

אלא רבי שמעון סבירא ליה כמאן דאמר מותרות לנדבת יחיד אזלי

is necessary only for the case of a burnt-offering which comes from surpluses [of sacrificial appropriations].<span class="x" onmousemove="('comment',' Where e.g., one separated money for a sin-offering or a guilt-offering and some of it was left over and with this money we purchased a burnt-offering.');">¹⁸</span>

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