﴿ لِّيَجْزِىَ ٱلَّذِينَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّٰلِحَٰتِ ۚ أُو۟لَٰٓئِكَ لَهُم مَّغْفِرَةٌۭ وَرِزْقٌۭ كَرِيمٌۭ ﴾

“to the end that He may reward those who believe and do right­eous deeds: [for] it is they whom forgiveness of sins awaits, and a most excellent sustenance”

لِّيَجْزِيَ الَّذِينَ آمَنُوا (So that He rewards those who believed - 4) This sentence is connected with the earlier one: لَتَأْتِيَنَّكُمْ that is, al-Qiyamah or the Doomsday is bound to come and its purpose will be to reward believers and to provide for them the best sustenance from Jannah (Paradise).