When the matter was revealed to Mordecai

This can be stated in active form. AT: "When Mordecai learned about what they were planning" (See: rc://en/ta/man/translate/figs-activepassive)

in the name of Mordecai

This is an idiom. AT: "on behalf of Mordecai" (See: rc://en/ta/man/translate/figs-idiom)