Where does “عسکر” come from?

عسکر (Classical Persian) comes from Arabic عَسْكَر, from Persian لشکر, from Middle Persian lškl, from Proto-Indo-Iranian Hrákšati, from Proto-Indo-European h₂lékseti, from Proto-Indo-European h₂lek- — to protect.

Ancestry of “عسکر”, step by step

Step	Language	Word	Meaning
1	Arabic	عَسْكَر	troops; army; soldiers, army
2	Persian	لشکر	army; division
3	Middle Persian	lškl	army
4	Proto-Indo-Iranian	Hrákšati	to protect, guard
5	Proto-Indo-European	h₂lékseti	to be protecting
6	Proto-Indo-European	h₂lek-	to protect

Every word from Proto-Indo-European h₂lek- →Every word from Proto-Indo-European h₂lékseti →Every word from Proto-Indo-Iranian Hrákšati →