´Abu 'Imaran Al-Jawni narrated :` "From Anas bin Malik who said : 'I do not recognize anything (today) from what we were upon during the time of The Messenger of Allah (s.a.w).' So I said : 'What about the Salat?' He said: 'Have you (people) not done what you know (you have done)?'" Other chains report similar narrations.
Hadith Referenceسنن ترمذي / كتاب صفة القيامة والرقائق والورع عن رسول الله صلى الله عليه وسلم / 2447
´Narrated Hadrami, the freed slave of the family of Al-Jarud:` from Nafi: "A man sneezed beside Ibn 'Umar and said: 'Al-Hamdulillah Was-Salamu 'Ala Rasulillah. (All praise is due to Allah, and peace upon the Messenger of Allah)'. So Ibn 'Umar said: 'I too say Al-Hamdulillah Was-Salamu 'Ala Rasulillah, but this is not what the Messenger of Allah (ﷺ) taught us. He taught us to say: "Al-Hamdulillah 'Ala Kulli Hal (All praise is due to Allah in every circumstance)."
Hadith Referenceسنن ترمذي / كتاب الأدب عن رسول الله صلى الله عليه وسلم / 2738
´Narrated Abu Musa:` "Never was a Hadith unclear to us - the Companions of the Messenger of Allah - and we asked 'Aishah, except that we found some knowledge concerning it with her."
Hadith Referenceسنن ترمذي / كتاب المناقب عن رسول الله صلى الله عليه وسلم / 3883