It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her); she said: I was with the Messenger of Allah (peace and blessings be upon him), and Sayyidah Maymunah (may Allah be pleased with her) was also with him, when Sayyiduna Ibn Umm Maktum (may Allah be pleased with him) came. The Messenger of Allah (peace and blessings be upon him) said: "Both of you observe hijab from him." We said: O Messenger of Allah, is he not blind, so that he can neither see us nor recognise us? He (peace and blessings be upon him) said: "And if (he is blind), what of you two? Do you not see him?"
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19982