Where does “心を配る” come from?

心を配る (Japanese) comes from Japanese 心, from Old Japanese 心, from Proto-Japonic *kəkərə.

Ancestry of “心を配る”, step by step

Step	Language	Word	Meaning
1	Japanese	心	mind, heart, spirit, soul; thoughts, ideas;...
2	Old Japanese	心	heart, mind, spirit; emotion, feeling; heart,...
3	Proto-Japonic	*kəkərə	—