The Prophet Muhammad (S.A.W.) final Sermon was the last saying he said which were very powerful and effective to me, he recited the following words below. It were his last words that he had recited to everyone in his time. It was delivered on the 9th of Dhul Hijjah – 6 March 632.
“All praise is Allah’s. We praise Him, seek His help, ask His forgiveness, and we repent unto Him. We seek refuge in Allah from the evils of our selves and our bad actions. Whomever Allah guides none can lead astray, and whomever He leads astray has no one to guide him. I testify that there is no god but Allah alone, without any partner, and I testify that Muhammad is His slave and Messenger. I enjoin you, O servants of Allah, to be god-fearing towards Allah, I urge you to obey Him, and I begin with that which is best.”
This effective to me because it spreads the message that Allah is one, he has no partner and no children. He has power over everything in this world and we should obey him.
The sermon also teaches me about manners, character and how a Muslim should behave towards others.