Reference for Nedarim 37:4

אמר ליה אמאי קא מדמית קדושה הבאה מאליה לקדושה הבאה בידי אדם

And it was taught thereon: They may neither be sheared nor put to service!<span class="x" onmousemove="('comment',' Just as certain firstlings. (v. Deut. XV, 19). How then can this be the view of R. Eliezer, who holds that when in doubt the animal is not regarded as consecrated? ');">⁴</span>

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