This root form (lemma) is used in 2 different forms in the NT: ἐδίστασαν (IAA3··P), ἐδίστασας (IAA2··S).
It is glossed in 2 different ways: ‘you doubted’, ‘doubted’.
OET MAT 14:31 Greek word=ἐδίστασας (edistasas) Morphology=IAA2··S English gloss=‘you doubted’ SR GNT MAT 14:31 word 18
OET MAT 28:17 Greek word=ἐδίστασαν (edistasan) Morphology=IAA3··P English gloss=‘doubted’ SR GNT MAT 28:17 word 8