Reference for Chullin 269:23

הא לאו בני גיזה נינהו דכתיב

Now this is so because Scripture stated: 'Of thy sheep', but without this [Scriptural indication] I should have said that consecrated animals are subject to the law of the first of the fleece; but surely they may not be shorn, for it is written: Thou shalt n shear the firstling of thy flock!<span class="x" onmousemove="('comment',' Deut. XV, 19.');"><sup>12</sup></span>