﴿ لِّيَغْفِرَ لَكَ ٱللَّهُ مَا تَقَدَّمَ مِن ذَنۢبِكَ وَمَا تَأَخَّرَ وَيُتِمَّ نِعْمَتَهُۥ عَلَيْكَ وَيَهْدِيَكَ صِرَٰطًۭا مُّسْتَقِيمًۭا ﴾

“so that God might show His forgiveness of all thy faults, past as well as future, and [thus] bestow upon thee the full measure of His blessings, and guide thee on a straight way,”

(That Allah may forgive thee of thy sin that which is past) before the revelation came to you (and that which is to come) and that which is after the revelation and until you die, (and may perfect His favour unto thee) through prophethood, Islam and forgiveness, (and may guide thee on a right path) and may hold you firm on an established way with which He is pleased, i.e. Islam,