It is narrated from Sayyidah Aishah (may Allah be pleased with her) that when the Messenger of Allah (peace and blessings be upon him) began the prayer, he would raise his hands up to his shoulders, then say: 'Subhanaka Allahumma wa bihamdika, wa tabaraka ismuka, wa ta'ala jadduka, wa la ilaha ghayruk' (You are free of all imperfection, O Allah, and with Your praise (I remember You); Your name is blessed, Your majesty is exalted, and there is no true god besides You).
We have only recorded this through the narration of Harithah bin Abi al-Rijal, and he is da'if (weak).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2348