Sayyiduna Abdullah bin Amr and Sayyiduna Sahl bin Abi Hathmah (may Allah be pleased with them) both narrate: Habibah bint Sahl was married to Thabit bin Qays bin Shammas al-Ansari (may Allah be pleased with him), but she disliked him, and he was an unattractive man. So that woman came to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah, when I see him, were it not for the fear of Allah, the Mighty and Majestic, I would spit in his face. The Messenger of Allah (peace and blessings be upon him) said: "Will you return to him his garden which he gave you as your dowry (mahr)?" I said: Yes. So he (peace and blessings be upon him) sent for him, and she returned his garden to him, and he (peace and blessings be upon him) separated the two of them. This was the first khul' that took place in Islam.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5616