“I heard Abā ʿAbdillāh (a) saying, ‘The Messenger of Allah (ṣ) addressed the grave of Saʿd and wiped his hand over it, and [as he did so] he began to quiver between his shoulders. So it was said to him, “O Messenger of Allah, we saw you addressing [the grave of Saʿd] as you were quivering between your shoulders, and you said, ‘Saʿd is undergoing this.’” So he said, “Verily there is no believer but that he will undergo squeezing [in the grave].”’”