Dictionary entry

πιστόω

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

πιστόω, -ῶ

(< πιστός), [in LXX chiefly for אמן ni.;]

to maketrustworthy (Thuc., III Ki 1:36), hence, to establish (I Ch 17:14). Pass. and mid., to be assured of: c. acc. rei, II Ti 3:14.†