Reference for Temurah 26:17

מאי קסבר

Said R'Nahman B'Isaac to Raba: According to R'Simeon who says: [Exchange is effected with] something which comes obligatorily, is it only an obligatory burnt-offering that can effect exchange but not a freewill burnt-offering? - He answered him: A freewill burnt-offering also; since he took upon himself [to offer it up],<span class="x" onmousemove="('comment',' Although he said 'Let this, etc.'.');">¹⁶</span>

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