It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "For every individual among the children of Adam, a share of adultery has been written, which he will inevitably attain. So the adultery of the eye is looking, the adultery of the foot is walking, the adultery of the ear is listening, the adultery of the hand is grasping, the adultery of the tongue is speaking, and the part of the heart is to desire and wish; and the private part confirms all of that or denies it." This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs did not record it.