Where does “قدم” come from?

قدم (Classical Persian) comes from Arabic قدم, from Proto-Semitic q-d-m — to precede, come before.

Ancestry of “قدم”, step by step

Step	Language	Word	Meaning
1	Arabic	قدم	to precede; to return from a journey; to come to,...
2	Proto-Semitic	q-d-m	to precede, come before