αὐσαυτοῦ
From LSJ
ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
English (LSJ)
τᾶς, τοῦ, Dor. for ἑαυτοῦ, τῆς, τοῦ, IG5(2).265.18 (Mantinea), GDI1696, al. (Delph.), 4959 (Eleutherna), IG4.840.3 (Calauria); cf. αὖς· αὐτός (Cret., Lacon.), Hsch.: Delph. αὐσωτόν, αὐσωτῶν, GDI1696, SIG703.11: Boeot. ἀσαυτῦ, A = ἑαυτῷ, IG7.3303 (Chaeronea); cf. αὐταυτοῦ.
Greek (Liddell-Scott)
αὐσαυτοῦ: -τᾶς, -τοῦ, Κρητ. τύπος ἀντὶ ἑαυτοῦ, -ῆς, -οῦ, Συλλ. Ἐπιγρ. 2566, πρβλ. Ahrens Δωρικ. Διαλ. 273.
Spanish (DGE)
v. αὐτοσαυτοῦ.