Musannaf Ibn Abi Shayba 33:609

Qabisa ibn Uqba narrated to us, from Malik ibn Mighwal, from Ibn Abjar, from Salama ibn Kuhayl: He said: Abu Juhayfa met me and said to me: "O Salama, nothing remains of what I used to know except this prayer. And there is no soul that I would be pleased to have ransom me from death, not even the soul of a fly." He said: Then he wept.