Sayyiduna Jabir (may Allah be pleased with him) said: I came to the Prophet (peace and blessings be upon him) while he (peace and blessings be upon him) was sitting with his knees drawn up, wrapped in a sheet, and its fringes had fallen over his (peace and blessings be upon him) feet.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5917