Sahih Muslim
Pertaining To The Charateristics Of The Hypocrites And Command Concerning Them (Kitab Sifat Al-Munafiqin Wa Ahkamihim)
Book Number: 038 / Hadith Number: 6678
Jabir reported Allah's Apostle (may peace be upon him) came to the grave of 'Abdullah b. Ubayy, brought him out from that, placed him on his knee and put his saliva in his mouth and shrouded him in his own shirt and Allah knows best.