Sunnan Abu Dawud Collection: ::Book Number 38:: Hadith # 4451
Narrated Sahl ibn Sa'd: A man came to the Prophet (peace_be_upon_him) and made acknowledgment before him that he had committed fornication with a woman whom he named. The Apostle of Allah (peace_be_upon_him) sent someone to the woman and he asked her about it. She denied that she had committed fornication. So he gave him the prescribed punishment of Lashes and left her.