Authentic Supplication Number 107.

It is reported by way of ‘Abdullah ibn ‘Az-Zubayr  that he used to say after each salat at about the time of tasleem (126) La ‘ilaha ‘illa ‘allahu wahdahu la shareeka lahu, lahul mulku, wa lahul hamdu, wa huwa `ala kulli shay’in qadeerun, la hawla wa la quwwata ‘illa bil-lahi, Ia ‘ilaha ‘illa ‘allahu, wa la na`budu ‘illa ‘iyyahu, lahun-ni`matu, wa lahul-fadhlu, wa lahu ‘ath-thana ‘ul-hasanu, la ‘ilaha ‘illa ‘allahu, mukhliseena lahud-deena wa law karihal-kafiroona (127). The Messenger of Allah  used to say these at the end of each prayer.

Footnotes.
(126) The action of turning to the right then to the left and saying “‘Al-Salamu ‘Alaykam …” upon each.
(127) There is no ‘ilah except Allah alone, no associate does He have, his is the Kingdom, to Him is All-Praise, and He is well able to do all things. There is neither might nor strength except by Allah. There is no ‘ilah except Allah, and we worship not any one except Him. His are the bounties, his is the favor, and to Him all good commemoration and praise is due. There is no ‘ilah except Allah, [we are] sincerely faithful to Him in our life, even if the infidels hate that.

Reporters.
Reported by Muslim, and is #90 in The Authentic of Good Sayings.