A more thorough explanation:

Aforesaid means something that has been mentioned or referred to previously. It can also be called aforementioned, above-mentioned, above-stated, or said.

• The aforesaid book was recommended by my teacher.
• As stated in the aforesaid email, the meeting will be held on Friday.

In the first example, the word "aforesaid" is used to refer to a book that was previously mentioned or recommended by the teacher. In the second example, "aforesaid" is used to refer to an email that was previously sent and stated the date of the meeting.