Sayyidah Umm Sulaym (may Allah be pleased with her) narrates: The Prophet (peace and blessings be upon him) used to offer prayer on a mat.
Imam Ahmad, Tabarani in al-Mu'jam al-Kabir, and Imam Abu Ya'la recorded it. Imam Ahmad's narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2264