ὅνδε

From LSJ

Ὑπὸ γὰρ λόγων ὁ νοῦς μετεωρίζεται ἐπαίρεταί τ' ἄνθρωπος → Borne up by words, the mind soars aloft, and we reach the heights (Aristophanes, Birds 1447f.)

Source

French (Bailly abrégé)

ὅς et suff. –δε = εἰς ὅν;
de ὅς relat.
de ὅς poét. p. ἑός.

Russian (Dvoretsky)

ὅνδε: adv. = εἰς ὅν.