اِنَّ الَّذِیْنَ قَالُوْا رَبُّنَا اللّٰهُ ثُمَّ اسْتَقَامُوْا فَلَا خَوْفٌ عَلَیْهِمْ وَ لَا هُمْ یَحْزَنُوْنَۚ(۱۳)اُولٰٓئِكَ اَصْحٰبُ الْجَنَّةِ خٰلِدِیْنَ فِیْهَا جَزَآءًۢ بِمَا كَانُوْا یَعْمَلُوْنَ(۱۴)(سورۃ الاحقاف)
Translation
Indeed, those who have said, "Our Lord is Allah," and then remained on a right course - there will be no fear concerning them, nor will they grieve. (13) Those are the companions of Paradise, abiding eternally therein as reward for what they used to do. (14) (Asan Tarjuma Quran)
Explanation: Remaining on a right course (steadfastness) includes remaining firm on this faith until the moment of death, and also leading a life in accordance with its requirements. (Asan Tarjuma Quran)