Ma'qil bin Yasar (may Allah be pleased with him) narrates that when the Messenger of Allah (peace and blessings be upon him) placed Nu'aym bin Mas'ud in the grave, he pulled out the pins fastening the shroud with his mouth.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6714