Musnad Ahmad 1110:1

Ali ibn Abdullah narrated to us, Muhammad ibn Fudayl ibn Ghazwan narrated to us, Muhammad ibn Sa’d al-Ansari narrated to us, he said: I heard Abu Dhabyah al-Kala’i saying: I heard al-Miqdad ibn al-Aswad saying: The Messenger of Allah (may Allah bless him and grant him peace) said to his companions: "What do you say regarding adultery?" They said: Allah and His Messenger have forbidden it, so it is forbidden until the Day of Resurrection. He said: Then the Messenger of Allah (may Allah bless him and grant him peace) said to his companions: "For a man to commit adultery with ten women is easier for him than to commit adultery with the wife of his neighbor." He said: Then he said: "What do you say regarding theft?" They said: Allah and His Messenger have forbidden it, so it is forbidden. He said: "For a man to steal from ten houses is easier for him than to steal from his neighbor."