Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) said: "Every human being has his share of adultery, which he will inevitably reach. The adultery of the eye is looking, the adultery of the tongue is speaking, the adultery of the heart is desiring, and the private part either confirms or denies it."
Hadith Referenceصحیح ابن حبان / كتاب الحدود / 4421
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح: ق نحوه - انظر ما قبله بحديث.فضيلة الشيخ العلّامة شُعيب الأرناؤوطحديث صحيح