Lexical Definition

‎τοί‎ toí (toy) certainly G:PRT
probably for the dative case of ‎ὁ‎

(used only with other particles in the comparative, as ‎καίτοιγε‎, ‎μέντοι‎, ‎τοιγαροῦν‎, ‎τοίνυν‎, etc.

Usage: 2 forms in 3 verses
Form Translated As     In Verse(s)
καίτοιγε καίτοιγε καίτοιγε and certainly indeed John.4.2
καίτοι καίτοι and yet Acts.14.17Heb.4.3

Liddell-Scott-Jones

τοί, ταί,

Epic dialect and poetry for οἱ or οἵ, αἱ or αἵ, nominative plural of and , frequently in [Refs 8th c.BC+], not in Ionic dialect Prose, rare in Trag., e.g. [Refs 4th c.BC+]: but in Doric dialect and certain other dialects as the Article, Ἱάρων.. καὶ τοὶ Συρακόσιοι [Refs 5th c.BC+]