σεαυτοῦ · seautou — LSJ
of thyself
of thyself, etc., in masc. and fem. of gen., dat., and acc. sg., first in Alc. 87, Pi. Fr. 97, Hdt. 1.45, 108; ἐν σαυτοῦ (v.l. -ῷ) γενοῦ contain thyself, S. Ph. 950: rarely in neut., φίλον ξύλον, ἔγειρέ μοι σεαυτὸ καὶ γίγνου θρασύ E. Fr. 693:—the Trag. use the longer form (but not so freq. as the shorter), S. Ant. 547, OT 312, etc.:—in pl. always separated, ὑμῶν αὐτῶν, etc.: and orig. separated in sg., as in Hom., who always has σοὶ αὐτῷ, σʼ αὐτόν; and so τὰ σʼ αὐτοῦ, τὰ σʼ αὐτῆς for τὰ σὰ αὐτοῦ