πιστότης

ητος, ἡ
A. good faith, honesty, Hdt. 7.52, Pl. Lg. 630c, etc.
2. πιστότητος ὑμῶν ἕνεκα in order to produce conviction in you, And. 1.25.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project