Hadith 3572
Narrated Abu Hurairah: The Prophet ﷺ said: He who has been appointed a judge among the people has been killed without a knife.
Hadith 4606
Aishah reported the Messenger of Allah ﷺ as saying: if any one introduces into this affair of ours anything which does not belong to it, it is rejected. Ibn Isa said: the prophet ﷺ said: if anyone practices any action in away other than our practice, it is rejected.