οὗτος G5129
by this, in this way; dative singular neuter indicating means, manner, or location
This is τούτῳ in its neuter dative function, meaning 'by this,' 'in this way,' or 'for this reason.' While identical in form to the masculine dative, its neuter usage indicated means, manner, or cause rather than persons. Phrases like 'by this we know' or 'in this way it was fulfilled' structured biblical theological argument. The dative of means was particularly important in explaining how divine purposes were accomplished or how spiritual realities could be recognized. Biblical writers used it to connect abstract principles with concrete outcomes, showing the mechanism or indicator by which truths could be understood or verified.
Senses
BDB / Lexicon Reference
οὗτος, αὕτη, τοῦτο, genitive τούτου, ταύτης, τούτου, etc.: the dual feminine never in Attic dialect, see ὁ, ἡ, τό, [near the start]:—demonstrative pronoun, this, common from Refs 8th c.BC+ __A ORIGIN and FORMS: οὗτος, αὕτη, τοῦτο probably arose from a reduplication of the demonstrative ὁ, ἡ, τό with insertion of -υ- (= Sanskrit Particle u), e.g. ταῦτα from τα-υ-τα: Doric dialect genitive singular…