en_tn/2th/01/10.md

when he comes on that day

Here "that day" is the day when Jesus will return to the world.

to be glorified by his people and to be marveled at by all those who believed

This can be stated in active form. AT: "when his people will glorify him and all those who believed will stand in awe of him" (See: rc://en/ta/man/translate/figs-activepassive)