Volume 3, Book 38, Number 508:
Narrated Zaid bin Khalid and Abu Huraira:
The Prophet said, “O Unais! Go to the wife of this (man) and if she confesses (that she has commit –
ted illegal sexual intercourse), then stone her to death.”

Volume 3, Book 34, Number 435:
Narrated Zaid bin Khalid and Abu Huraira:
that Allah’s Apostle was asked about an unmarried slave-girl who committed illegal sexual inter –
course. They heard him saying, “Flog her, and if she commits illegal sexual intercourse after that, flog
her again, and on the third (or the fourth) offense, sell her.”