Musannaf Ibn Abi Shayba 19:482

Abu Bakr narrated to us, he said: Abd al-A’la narrated to us, from Sa’id, from Qatadah, who said: I said to Sa’id ibn al-Musayyib: "If he marries her during her waiting period intentionally?" He said: "The prescribed punishment (hadd) is to be carried out upon them."