2 Thessalonians 1 10
When He comes to be glorified in His saints [on that day He will be made more glorious in His consecrated people], and [He will] be marveled at and admired [in His glory reflected] in all who have believed [who have adhered to, trusted in, and relied on Him], because our witnessing among you was confidently accepted and believed [and confirmed in your lives].
Compare with other 3 random translations
LSV 2 Thessalonians 1:10when He may come to be glorified in His holy ones, and to be wondered at by all those believing—because our testimony was believed among you—in that day;
KJV 2 Thessalonians 1:10When he shall come to be glorified in his saints, and to be admired in all them that believe (because our testimony among you was believed) in that day.
EAS 2 Thessalonians 1:10This will happen when Jesus comes on that special day. His own people will praise him for the great things that he has done for them. All of us who are believers will be surprised when we see his great power. This includes you, because you believed our message about the Lord Jesus.