People are subject to changes, today anyone may promise you with something but tomorrow he may die or becomes unable to fulfil his promise, but when Allah (swt), The Living, The The Ever-Sustaining, The Able … His promise certainly will be fulfilled.

(… الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ …) (…promised those who believe and do righteous deeds …): Allah (swt) does not refer just to faith, rather it is followed by doing righteousness, that is the practical application of faith reflected by doing what is allowed and avoid what is forbidden.

(  لَهُم مَّغْفِرَةٌ وَأَجْرٌ عَظِيمٌ… ) (for them there is forgiveness and great reward …): Allah (swt) has prepared forgiveness for the repentant servant, followed by the great reward, which is the meeting with Allah (swt) in the gardens of bliss.