Abdullah bin Ubayy was brought to the Prophet ﷺ after he had been placed in his grave. The Prophet ﷺ laid him on his knees, clothed him in his own shirt, and breathed some of his saliva upon him.
حدثنا سفيان بن عيينة عن عمرو بن دينار سمعه من
أتى النبي ﷺ عبد الله بن أبي بعد ما أدخل في حفرته فوضعه على ركبته وألبسه قميصه ونفث عليه من ريقه
Its isnad is sahih. It was mentioned before in similar wording. See Bukhari 10/266, no. 5795, in Fath al-Bari, Book of Clothing, Wearing a Shirt, Muslim 4/2140, no. 2773, in the Description of the Hypocrites, and Nasai 4/38, in the Book of Funerals, the Shirt in the Shroud.