Sunan At-Tirmidhi

Ibn Abdullah bin Mughaffal narrated:""While I was praying, I said: Bismillahir-Rahmanir-Rahim ""In the Name of Allah, the Merciful, the Beneficent."" My father heard me and said: ""O my son this is a newly invented matter, beware of the newly-invented.'"" He (Ibn Abdullah) said: ""I have not seen any one of the Companions of Allah's Messenger who hated a newly invented matter in Islam more than him. And he said: 'Ihave performed Salat with the Prophet, and with Abu Bakr, and Umar, and with Uthman. I did not hear any one of them saying it. So do not say it. When you are performing Salat say: Al-Hamdu lilahi Rabbil-Alamin ""All praise is due to Allah the Lord of all that exists