For those who believe and do righteous, their same deeds that they used to do when they were young and healthy are written to them when they get old.

Faith is the harmony between life’s actions with what is inside the heart, in accordance to Allah’s (swt) satisfaction. Verify, the system of life stands up only on faith:

 {وَالْعَصْرِ % إِنَّ الْإِنسَانَ لَفِي خُسْرٍ % إِلَّا الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ وَتَوَاصَوْا بِالْحَقِّ وَتَوَاصَوْا بِالصَّبْرِ }

(By time, % Indeed, mankind is in loss, % Except for those who have believed and done righteous deeds and advised each other to truth and advised each other to patience.) (Al-Asr: 1-3)

It agrees:

 ثُمَّ رَدَدْنَاهُ أَسْفَلَ سَافِلِينَ

(Then We return him to the lowest of the low, (5))

Because after both of them: (Except for those who have believed and done righteous deeds).

Faith requires deeds, faith and deeds represent belief, good behavior and straightness. You cannot say: There is faith without deeds, Allah (swt) says:

 {نِعْمَ أَجْرُ الْعَامِلِينَ}

(..Excellent is the reward of the [righteous] workers…) (Al-Ankabout: 58)

أَجْرٌ غَيْرُ مَمْنُونٍ (a reward uninterrupted): A reward is neither incomplete nor cut; rather, it is continuous and permanent, so that the believer will be content with his reward in this life, when he prays, pays alms, pays charity, smiles, fasts, makes Hajj and whatever he does according to Allah’s (swt) method, he will get a reward, not only as much as the deeds, but triple rewards. Verify, Allah’s (swt) bestowment is not transient as the life’s bestowment, but it is uncut, eternal and fixed:

 {بَلَىٰ مَنْ أَسْلَمَ وَجْهَهُ لِلَّهِ وَهُوَ مُحْسِنٌ فَلَهُ أَجْرُهُ عِندَ رَبِّهِ وَلَا خَوْفٌ عَلَيْهِمْ وَلَا هُمْ يَحْزَنُونَ }

(Yes [on the contrary], whoever submits his face in Islam to Allah while being a doer of good will have his reward with his Lord. And no fear will there be concerning them, nor will they grieve.) (Al-Baqara: 112)