This root form (lemma) is used in 2 different forms in the NT: διαβεβαιοῦνται (IPM3··P), διαβεβαιοῦσθαι (NPM····).
It is glossed in 2 different ways: ‘to_be confirming’, ‘they are confirming’.
OET 1TIM 1:7 Greek word=διαβεβαιοῦνται (diabebaiountai) Morphology=IPM3··P English gloss=‘they are confirming’ SR GNT 1TIM 1:7 word 12
OET TIT 3:8 Greek word=διαβεβαιοῦσθαι (diabebaiousthai) Morphology=NPM···· English gloss=‘to_be confirming’ SR GNT TIT 3:8 word 9