لِ Purpose

A word in the Arabic language will either be 1) a verb or 2) a noun or 3) a particle – لَامُ of purpose is a particle

لِ (with kasrah) is used for emphasis meaning ‘in order to’, ‘that he may’ and it denotes purpose, result, consequence, end

حَرْفُ نَصْبٍلtoحَرْفٌلَامُ التَّعْلِيْلِ
Accusative particleRootParticleParticle of reason/cause/purpose
Surah/Below are the 2+ verses in the holy Quran containing the particle of reasonلَامُ التَّعْلِيْلِ
Verse
And not were they commanded except to worship Allah (SWT) being sincere to Him, the upright religionوَمَآ أُمِرُوْا إِلَّا لِيَعْبُدُوْا اللهَ مُخْلِصِيْنَ لَهُ الدِّيْنَ حُنَفَآءَ
98-5and to establish the prayer and to give the charity (obligatory tax) and that is the correct religionوَيُقِيْمُوْا الصَّلَاةَ وَيُؤْتُوْا الزَّكَاةَ وَذَلِكَ دِيْنُ القَيِّمَةِ
99-6That day mankind will proceed in groups to be shown their deedsيَوْمَئِذٍ يَصْدُرُ النَّاسُ أَشْتَاتًا لِّيُرَوْا أَعْمَالَهُمْ