Narrated Muawiya: I heard the Prophet (sal Allahu alaihi wa sallam) saying, "A group of people amongst my followers will remain obedient to Allah's orders and they will not be harmed by anyone who will not help them or who will oppose them, till Allah's Order (the Last Day) comes upon them while they are still on the right path." [Bukhari]
These are really good tidings for us, that no matter what the enemies of Islam try, they will never be able to annihilate Islam. There will always, till the Day of Judgment, be Muslims who are rightly guided and rightly guiding. Congratulations to such people, for Allah (subhana wa ta'ala) promises that nobody will be able to harm them.
Regarding the qualities of these people who are fully obedient to Allah's shariah, Yahya ibn Mu'adh (rahimu Allah) said: "Congratulations to those who leave the world before it deserts them; to those who build their graves before they enter them; and to those who please their Lord before they meet Him."
Ahmad bin Bindar narrated that Abu Hurairah (radi Allahu anhu) cried during his last illness, and when asked about it said, "Surely I am not crying being attached to your world, but rather for the long journey awaiting me, and the little provisions I have prepared for it. This morning, I am descending upon either paradise, or hell, and I have no idea towards which of the two I will be taken!" Abu Hurairah is a primary cause of Islam reaching us. Abu Hurairah (radi Allahu anhu) was the famous Companion of the Prophet (sal Allahu alaihi wa sallam) who reported 5374 ahadith. He would divide his nights into three parts. In one third of the night he would perform salaah, in one third he would sleep and in one third he would memorize the ahadith of the Holy Prophet. If Abu Hurairah (radi Allahu anhu), the narrator of the greatest number of ahadith, worried so much about his hereafter, how much more cause do I have to worry about it!