Musannaf Ibn Abi Shayba 33:1199

Abdullah ibn Numayr narrated to us, from Malik ibn Mighwal, from Abu Mansur, from Zayd ibn Wahb, who said: I went out to the graveyard and sat there beside a wall. A man came to a grave and leveled it, then he came and sat beside me. I said, "Who is this?" He said, "My brother." I said, "A brother of yours by lineage?" He said, "A brother of mine in Islam. I saw him last night in what a sleeper sees [in a dream], and I said, 'So-and-so, you have lived [again]? Praise be to Allah, Lord of the Worlds.' He said, 'I have said it. That I should be more capable of saying it is more beloved to me than the fullness of the earth and what is in it. Do you not see that when they were burying me, so-and-so stood up and prayed two rak'ahs? That I should be more capable of praying them is more beloved to me than the world and what is in it.'"