Sahih Adab al-Mufrad

It is narrated from Sayyiduna Mu’adh bin Jabal (may Allah be pleased with him) that he said: The Prophet (peace and blessings of Allah be upon him) took my hand and said: “O Mu’adh!” I said: At your service. The Prophet (peace and blessings of Allah be upon him) said: “Indeed, I love you.” I said: By Allah, I also love you. The Prophet (peace and blessings of Allah be upon him) said: “Shall I not teach you some words which you should recite after every prayer?” I said: Yes, indeed. The Prophet (peace and blessings of Allah be upon him) said: “Say! «اللهم أعني على ذكرك وشكرك ، وحسن عبادتك».”