Reference for Chullin 269:7

וב"ה אומרים

BETH HILLEL SAY, FIVE, AS IT IS SAID, FIVE SHEEP READY DRESSED.<span class="x" onmousemove="('comment',' I Sam. XXV, 18. The expression 'ready dressed', is interpreted to mean that the commandment () of the first of the fleece had been fulfilled in respect of them.');">⁴</span>

Jastrow