1)
What are the implications of the words "al Chataso asher Chata"?
1.
Kerisos, 9a: It implies that a man who is intimate five times with one Shifchah Charufah in one He'elam (without remembering in between) is Chayav only one Asham.
2)
Why does the Pasuk repeat the (otherwise superfluous) words "me'Chataso asher Chata"?