Pausanias Description of Greece 1.24.4

[4] also, there is a statue [ agalma] of Zeus, one made by Leokhares 83

and another one called Polieus [‘of the city’], the traditions [ kathestēkota] for sacrificing [ thusiā] to whom I will write down [ graphein] without writing down [ graphein] the reason [ aitiā] for [ epi+ dative] these [traditions]. Upon the altar [ bōmos] of Zeus Polieus they place barley mixed with wheat and leave it unguarded. The ox, which they keep already prepared for sacrifice [ thusiā], goes to the altar [ bōmos] and makes contact [ haptesthai] with the grain [ spermata]. One of the priests [ hiereis] they call the ox-slayer [ bouphonos], and he kills the ox; then, casting aside the axe [ pelekus] at that spot, according to the ritual [ nomos], he runs away. The others bring the axe [ pelekus] to trial [ dikē], as if they did not know the man who did [ drân] the deed [ ergon].