Reference for Chullin 281:16

שלח חדא זימנא תשלח תרי זימנין

whence do I know [that this law applies even when it is required] for the fulfilment of a precept?<span class="x" onmousemove="('comment',' E.g., for the leper's sacrifice (Lev. XIV, 4) or for the sacrifice of a woman after childbirth (ibid. XII, 8) . Whence do I know that even for these religious purposes it is not permitted to take the dam?');">¹²</span>

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