Yahya bin al-Jazzar narrates: Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) prayed while there was dung and blood on his stomach from a camel he had slaughtered (by nahr), and he did not perform ablution (wudu).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9187