Shayk Abdul Muhsin: “Sami Allahu liman hamida is for Imam as for those praying behind saying Rabbanna walakal hamd suffices.”
[Taken from the lessons on “Conditions, Pillars and Obligation of Salah – Shaykh ul Islaam Muhammad bin Abdil Wahhab رحمه الله Explanation by Shaykh Abdul Muhsin al abbaad حفظه الله Taught by: Abdulilah Lahmami]