I have said to you, "Let my son go, that he may worship Me," yet you refuse to let him go.

我已经告诉过你，“让我的孩子离开，他要崇拜我“,但是你却不让他走。

耶鲁公开课 - 旧约导论课程节选

You could tell him that you've already taken care of it by using the "I've already" pattern.

你可以用“I've already”句型告诉他你已经处理过那个问题了。

I've already 课堂 - SpeakingMax英语口语达人