question #3 Sahih Muslim 771b, Book 6, Hadith 241 : What is the significance of pronouncing takbir at the start of the prayer in Islam?

I turn my face (up to Thee), I am the first of the believers; and when he raised his head from ruku’ he said: Allah listened to him who praised Him; O our Lord, praise be to Thee; and he said: He shaped (man) and how fine is his shape? And he (the narrator) said: When he pronounced salutation he said: O Allah, forgive me my earlier (sins), to the end of the hadith; and he did not say it between the Tashahhud and salutation (as mentioned above).