Musannaf Ibn Abi Shayba 6:870

Hatim ibn Wardan narrated to us, from al-Jurayri, from a man, from Abu Hurayrah, who said: I witnessed al-Ala’ ibn al-Hadrami, so we buried him, but we forgot to untie the knots [of the shroud] until we had placed him into his grave. He said: So we lifted the mud-bricks from him, but we did not see anything in the grave.