The purpose لِ attaches to an imperfect and explains why the earlier action happens.
خَلَقَ اللَّهُ النَّاسَ لِيَعْبُدُوهُ — Allah created people so that they may worship Him.
خَرَجْتُ مِنَ الْفَصْلِ لِأَشْرَبَ الْمَاءَ — I left the classroom to drink water.
It is called Lām Kay or Lām Ta‘līl. In this lesson it is the purpose lām; not every lām has this function.
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Kay, Idhan, Hatta and Purpose Li
The purpose لِ attaches to an imperfect and explains why the earlier action happens.
خَلَقَ اللَّهُ النَّاسَ لِيَعْبُدُوهُ — Allah created people so that they may worship Him.
خَرَجْتُ مِنَ الْفَصْلِ لِأَشْرَبَ الْمَاءَ — I left the classroom to drink water.
It is called Lām Kay or Lām Ta‘līl. In this lesson it is the purpose lām; not every lām has this function.