Reference for Chullin 4:2

וכל הכל לאו לכתחלה הוא

Behold, I take it upon me [to bring a sacrifice]'.<span class="x" onmousemove="('comment',' In the former case one who so vows is not liable to replace the animal if it is stolen or lost or has died, therefore if he has set aside the animal there is little fear that he will not fulfil his obligation; in the latter case the one who vows must supply an animal and is liable to replace it in all events, and there is therefore the danger of his not fulfilling his obligation. All vows of 'valuation' and of 'worth' come under this latter head; consequently the Mishnah quoted cannot possibly imply a right in the first instance.');">¹</span>

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