Ata bin Abi Rabah narrates from Sayyidah Aishah (may Allah be pleased with her) that what is meant by "what appears of it" [Surah al-Nur: 31] is the face and the two hands.
It is reported from Ibn Umar (may Allah be pleased with them both) that he said: What is meant by it is the outward adornment, the face and the two hands; and something with the same meaning is also reported from Ata bin Abi Rabah and Sa'id bin Jubayr.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3217