On the authority of Abu Najih Al-Erbadh bin Sariah, who said :
The messenger of Allah gave us a sermon by which our hearts were filled with fear and tears came to our eyes. We said: "O Messenger of Allah, it is as though this is a farewell sermon, so counsel us." He said: "I counsel you to fear Allah and to give absolute obedience even if a slave becomes your leader. Verily he among you who lives [long] will see great controversy, so you must keep to my sunnah and to the sunnah of the rightly-guided Khalifahs - cling to them stubbornly. Beware of newly invented matters, for every invented matter is an innovation and every innovation is a going astray, and every going astray is in Hell-fire."
related by Abu Dawud and Al-Tirmithi, who said that it was a fine and true Hadith.
Assalamu alaykum,
This goes to show we cannot act upon our own whims and desires. Had we want to carry something out in matters of worship, examples have been set and the deen has been perfected for us. So, we take on these examples (as had been done by our Prophet sallalahu 'alayhi wassalam and his companions, and the generation which comes after - salaf). Had we done something which we had whipped up by our own fanciful desires, are we saying that we are better than the salaf, people closer to the Prophet, introducing something we feel is "good" when in reality - it is not in the sharee'ah?
This is a long-term argument, I suppose. People will always refute that it is "bid'ah hasanat" when in true fact, there is no such thing where it concerns our ibadaah. Example, people these days go all the way out to gather, do loud dhikr and get carried away. Sure, sounds good. Why not? Innocent too. But the hadith above takes precedence, so whatever good you think it is but it is NOT taught by the salaf, we leave it. Everyone wants goodness - who doesn't, but it has no example from the salaf and is our own desire so we shouldn't near it at all.
So it means, following your desire where it concerns ibadaah. The shaitan has means to lead us astray, so don't be fooled, Allaahu a'lam