It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, the believer has been created prone to trial, repenting often, and forgetful; when he is reminded, he remembers."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10620