Reference for Temurah 49:49

ואם משאמר הרי זו שלמים נמלך ואמר ולדה עולה הרי זו ולדה שלמים

The case therefore is like one who sets aside two sin-offerings for security's sake, where if he wishes, he can obtain atonement through it [the one animal], and if he wishes, through the other.<span class="x" onmousemove="('comment',' And the sin-offering which he does not use is condemned to pasture.');">⁴⁰</span>

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