ἐκεῖθι
From LSJ
Θεράπευε τὸν δυνάμενον, ἄνπερ νοῦν ἔχῃς (αἰεί σ' ὠφελεῖν) → Si mens est tibi, coles potentes qui sient → Dem Mächtigen sei zu Willen, bist du bei Verstand (Sei immer dem zu Willen, der dir nützen kann)
English (LSJ)
and κεῖθι (the only form used by Hom. exc. Od.17.10, also by Trag. where metre requires), Aeol. κῆθι Sapph.Supp.25.18 (prob.) : Dor. τηνόθι Theoc.8.44 : poet. for ἐκεῖ, Il.3.402, Od.17.10 : in late Prose,
A οἱ ἐκεῖθι Ael.NA6.15 ; κεῖθι Alciphr.3.53, Them.Or.4.57a. II = ἐκεῖσε, κεῖθι μολών Hes.Fr.134.10, cf. Musae.23, Opp. H.4.274, dub. in A.Th.809.
