on that day when he comes to be glorified in his saints, and to be marveled at by all who have believed (pisteusasin | πιστεύσασιν | aor act ptcp dat pl masc), because our testimony to you was believed (episteuthē | ἐπιστεύθη | aor pass ind 3 sg).
Reference
2 Thessalonians 1:10
Sequence
194