It is narrated from Sayyiduna al-Miqdad bin al-Aswad (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) asked the Companions about adultery (zina), and they said: "It is unlawful; Allah and His Messenger have made it unlawful." He (peace and blessings be upon him) said: "For a man to commit adultery with ten women is less evil for him than to commit adultery with his neighbour's wife." He (peace and blessings be upon him) also asked them about theft, and they said: "It is unlawful; Allah and His Messenger have made it unlawful." He (peace and blessings be upon him) said: "For a man to steal from ten houses is lighter for him than to steal from his neighbour's house."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17739