12 When Moab appears at her high place, she only wears herself out; when she goes to her shrine to pray, it is to no avail.

Read Isaiah 16:12 Using Other Translations

And it shall come to pass, when it is seen that Moab is weary on the high place, that he shall come to his sanctuary to pray; but he shall not prevail.
And when Moab presents himself, when he wearies himself on the high place, when he comes to his sanctuary to pray, he will not prevail.
The people of Moab will worship at their pagan shrines, but it will do them no good. They will cry to the gods in their temples, but no one will be able to save them.