Sayyiduna Hanzalah bin Hidhyam (may Allah be pleased with him) narrates: "I came to the Messenger of Allah (peace and blessings be upon him) and saw that he ((peace and blessings be upon him)) was sitting cross-legged."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3485