Musnad Ahmad 31:907

'Affan narrated to us, Hammad bin Zayd narrated to us, Abu al-Sahba' narrated to us, he said: I heard Sa'id bin Jubayr narrating from Abu Sa'id al-Khudri—I do not know it except that he attributed it to the Prophet (marfu')—he said: "When the son of Adam wakes up in the morning, his limbs humble themselves before the tongue, saying: 'Fear Allah regarding us, for if you are upright, we are upright, and if you deviate, we deviate.'"