Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: I heard the Prophet (peace and blessings be upon him) say: "The soul of the believer departs with sweat, and I do not like a death like the death of a donkey." It was asked: What is the death of a donkey? He (peace and blessings be upon him) said: "The soul of the disbeliever departs from the corners of his mouth."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10013