Salamah bin Kuhayl (may Allah have mercy on him) said: Sayyiduna Abu Juhayfah (may Allah be pleased with him) met me and said: O Salamah, nothing remains of what I used to recognise except this prayer, and there is no soul whose shielding me from death would please me, even if it were the soul of a fly.
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18545