It is narrated from Sayyiduna Sahl bin Sa'd (may Allah be pleased with him), as a marfu' report, that the Messenger of Allah (peace and blessings be upon him) said: "With Allah are the treasuries of good and evil, and their keys are people. So glad tidings to the one whom Allah has made a key to good and a lock against evil, and woe to the one whom Allah has made a key to evil and a lock against good."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5791