Anas said, "I do not recognize anything today of what we used to be upon during the time of the Messenger of Allah ﷺ."We said to him, "What about the prayer?"He replied, "Have you not done with the prayer what you already know you have done?"
حدثنا زياد بن الربيع أبو خداش اليحمدي قال سمعت أبا عمران الجوني يقول سمعت
ما أعرف شيئا اليوم مما كنا عليه على عهد رسول الله ﷺ قال قلنا له فأين الصلاة قال أولم تصنعوا في الصلاة ما قد علمتم
Its isnad is sahih, and it is an addition from a trustworthy narrator. Abu Imran Jawni is Abdul-Malik bin Habib Azdi, who is trustworthy. The hadith, with similar wording, is found in Bukhari 2/13, no. 529, in the Book of Prayer, chapter on Neglecting the Prayer.