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Woordstudie
Brown-Driver-Briggs Abridged Hebrew Lexicon
מָתַי 43 interrog.adv. when
Strong Concise Dictionary Of The Words In The Hebrew Bible
H4970מָתַיmâthay; from an unused root meaning to extend; properly, extent (of time); but used only adverbially (especially with other particle prefixes), when (either relative or interrogative) — long, when.