Authentic Supplication Number 063.

The Messenger of Allah  said "If one of you, when the mu'ath-thin would say: 'Allahu 'akbaru 'allahu 'akbaru says: 'Allahu 'akbaru 'allahu 'akbaru, then when he would say: Ash-hadu an la 'ilaha 'illa 'allahu, says: Ash-hadu 'an la 'ilaha 'illa 'allahu, then when he would say: Ash-hadu 'anna muhammadan rasoolullahi says: Ash-hadu 'anna muhammadan rasoolullahi, then when he would say: Hayya `alas-salat, says: La hawla wa la quwwata 'illa bil-lahi (80), then when he would say: Hayya `alal falah, says: La hawla wa la quwwata 'illa bil-lahi, then when would say: 'Allahu 'akbaru 'allahu 'akbaru, says: 'Allahu 'akbaru 'allahu 'akbaru, then when he would say: La 'ilaha 'illa 'allahu, says: La 'ilaha 'illa 'allahu, from his heart, he will enter Heaven".

Footnotes.
(80) This means: There is neither Might, nor Strength except by Allah.

Reporters.
Reported by Muslim and is #56 in The Authentic of Good Sayings.