Sayyidah Aishah (may Allah be pleased with her) said that the Messenger of Allah (peace and blessings be upon him) said: "When any of you is put in charge of some work and Allah intends good for him, He grants him a righteous minister who reminds him if he forgets and helps him if he remembers."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20319