Sayyidah Umm Salamah (may Allah be pleased with her) said: He (peace and blessings be upon him) entered the house of Sayyidah Maymunah (may Allah be pleased with her), where Sayyidah Maymunah (may Allah be pleased with her) and I were sitting. Sayyiduna Abdullah bin Umm Maktum (may Allah be pleased with him), who was blind, asked permission (to enter), and he (peace and blessings be upon him) said: "Both of you, screen yourselves from him." We said: O Messenger of Allah (peace and blessings be upon him)! Is he not blind? He cannot even see us. He (peace and blessings be upon him) said: "Are you two not seeing him?"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13524