Sahm bin Hubaysh, who was present at the killing of Uthman (may Allah be pleased with him), said: When evening came upon us, I said: If you leave your companion ('s body) like this until morning, the people will mutilate him. So take him to Baqi' al-Gharqad. So we prepared a place (for the grave) for him in the middle of the night. Then we carried him, and a dark mass (a crowd of people) appeared behind us. We became afraid of them, until we were about to scatter, but a caller called out: Have no fear, stand firm; we have only come to take part in this burial with you. Ibn Hubaysh used to say: By Allah! They were the angels.
Hadith Referenceالمعجم الكبير للطبراني / العشرة / 109