In the Iliad, book 6, there is a line were Hector is speaking to his mother.
"...Get the matrons together, and go with offerings to the temple of Athena driver of the spoil; there, upon the knees of Athena, lay the largest and fairest robe you have in your house - the one you set most store by; promise, moreover, to sacrifice twelve yearling heifers that have never yet felt the goad, in the temple of the goddess if she will take pity on the town, with the wives and little ones of the Trojans, and keep the son..."
Note: Bold is my own format.
Goad has the meaning of a cattle prod. Why was it important for the young heifers to have never been steered with a goad?