Sayyiduna Abdullah bin Salam (may Allah be pleased with him) said: We were discussing among ourselves, and we said: "Who among us will go to the Messenger of Allah (peace and blessings be upon him) and ask him which deed is most beloved to Allah?" But we were too awed for any of us to get up (and go himself). Then the Messenger of Allah (peace and blessings be upon him) himself sent a man to us; we began pointing to one another. Then he recited to us from beginning to end: "Whatever is in the heavens and whatever is on the earth glorifies Allah." (And in the same way, each narrator, having heard it from the narrator before him, recited it from beginning to end to those after him.)
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14004