Imam al-Dhahabi in his Siyar (20/439-451) mentions a karamah of Sayyidi Shaykh Abd al-Qadir al-Gilani (Allah sanctify his secret) which reminded me of the title of this blog post. Imam al-Dhahabi said:
Muhammad bin Muhammad al-Maratibi said, I heard Shaykh Abu Bakr al-Imad (Allah have mercy on him) say:
I studied Usul al-Din (belief), and there occurred a doubt in me so I said: I will go to the gathering of Shaykh Abd al-Qadir, it is said he speaks regarding peoples private thoughts.
I went and he was speaking, he said, ‘Our belief is that of the pious predecessors (salaf al-salih) and the companions’.
I said to myself: ‘He said this by coincidence’.
He spoke [again] and then turned towards me and repeated it.
I said ‘A preacher does look around’.
He addressed me for the third time and said: ‘O Abu Bakr!’ and he repeated his words and then said: ‘Stand, your father has arrived’ and he had been absent. I stood and went and found that my father had come.