Hadith 429
حفظت سكتتين فى الصلاة سكتة اذا كبر الامام حتي يقرا وسكتة اذا فرغ من فاتحة الكتاب وسورة عند الركوع
"I have remembered two pauses in the prayer: one pause (of silence) when the Imam says the opening Takbir until he begins the recitation, and one pause after completing Surah Al-Fatihah and another Surah before bowing (ruku’)."