the teaching is Moses and Elijah or Enoch and Elijah.
So, Moses because he was used to show signs, and wonders. Some of the attributes of the witnesses will be signs and wonders, so that's where the idea is from.
If I may jump in :) Also these two men Elijah and Moses came back to earth and were on the Mount of Transfiguration with Christ. 17 chapter of Matthew I think.
The general teaching on the two witnesses points to three people Elijah Moses and Enoch
Any particular reason why Moses?
So, Moses because he was used to show signs, and wonders. Some of the attributes of the witnesses will be signs and wonders, so that's where the idea is from.