It was a settled principle of the Persian government that “Royal Benefactors” were to receive an adequate reward. The names of such persons were placed on a special roll, and care was taken that they should be properly recompensed, though they sometimes waited for months or years before they were rewarded.
Related Commentaries of Esther 6:3
Esther 6:3
3 And the king said, What honour and dignity hath been done to Mordecai for this? Then said the king's servants that ministered unto him, There is nothing done for him.