Mu`adh (May Allah be pleased with him) reported:
The Messenger of Allah (Sall-Allahu alayhi wa sallam )
took hold of my hand and said,
"O Mu`adh! By Allah I love you,
so I advise you to never forget to recite after every prayer:
"Allahumma a`inni ala dhikrika,
wa shukrika, wa husni `ibadatika"
(O Allah, help me remember You, to be grateful to You,
and to worship You in an excellent manner).