on the day He comes to be glorified in His saints and regarded with wonder by all who have believed, including you who have believed our testimony.
KJV
When 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.
ASV
when he shall come to be glorified in his saints, and to be marvelled at in all them that believed (because our testimony unto you was believed) in that day.