It is narrated from Hazrat Mu'adh (may Allah be pleased with him) that one day I met the Noble Prophet (peace and blessings be upon him), and he said to me, "O Mu'adh! I love you." I replied, "O Messenger of Allah! By Allah, I also love you." The Noble Prophet (peace and blessings be upon him) said, "Mu'adh! I advise you not to leave this supplication after any obligatory prayer: 'O Allah! Help me to remember You, to thank You, and to worship You in the best manner.'"
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22126