Passage 2.35.6
τοῖς δὲ τὴν πομπὴν πέμπουσιν ἕπονται τελείαν ἐξ ἀγέλης βοῦν ἄγοντες διειλημμένην δεσμοῖς τε καὶ ὑβρίζουσαν ἔτι ὑπὸ ἀγριότητος. ἐλάσαντες δὲ πρὸς τὸν ναὸν οἱ μὲν ἔσω φέρεσθαι τὴν βοῦν ἐς τὸ ἱερὸν ἀνῆκαν ἐκ τῶν δεσμῶν, ἕτεροι δὲ ἀναπεπταμένας ἔχοντες τέως τὰς θύρας, ἐπειδὰν τὴν βοῦν ἴδωσιν ἐντὸς τοῦ ναοῦ, προσέθεσαν τὰς θύρας.
Those conducting the procession are followed by others leading a full-grown cow chosen from the herd, bound in ropes and still violent from its wildness. Once they have driven it towards the temple, some loosen the ropes to let the cow run inside the sanctuary, while others, who until then hold the doors open wide, shut them as soon as they see the cow enter within.