Bayhaqi 2345 — The opening supplication after the takbir

Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) narrates from the Messenger of Allah (peace and blessings be upon him) that when he (peace and blessings be upon him) stood for an obligatory prayer, he would say the takbir and raise both his hands up to his shoulders. Then he mentioned the complete hadith. In it there is also that when he (peace and blessings be upon him) began the prayer after the takbir, he would recite 'Wajjahtu wajhiya'; he mentioned the complete supplication, and 'wa ana min al-muslimin' (and I am of the Muslims. O Allah, You alone are the King; there is no true god besides You. You are free of all imperfection. You are my Lord and I am Your servant). Then he mentioned the complete supplication but did not recite from 'wahdini' up to 'labbayk', then: 'Labbayka wa sa'dayk, ana bika wa ilayk, la manja minka illa ilayk, astaghfiruka thumma atubu ilayk' (O Allah, here I am at Your court; I am with You and I have placed my hope in You alone. There is no refuge from You except with You. I seek Your forgiveness, then I turn to You alone in repentance).
Then he mentioned a hadith like the hadith of Abd al-Aziz, and the hadith of Abd al-Aziz is more complete.