It is narrated from Sayyiduna Wathilah bin al-Asqa' (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "There is no Muslim who is put in charge of any affair of the Muslims except that Allah sends to him two angels who keep him on the right course as long as he holds to the truth; and when he deliberately intends injustice, Allah leaves him to himself."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18424