Musnad Abu Ya'la al-Mawsili 209:101

Abu Khaythama narrated to us, Yazid bin Harun narrated to us, Hammam bin Yahya narrated to us, from Qatada, from Abu al-Khalil, from Safina, from Umm Salama, that the Prophet (may Allah bless him and grant him peace) said while he was in the state of death: "The prayer, and what your right hands possess." He kept saying it, and his tongue could not articulate it clearly.