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 — heart.

Ancestry of “心を配る”, step by step

心を配る traces back through two separate lines of ancestry.

via Japanese 心

StepLanguageWordMeaning
1Japanese心mind, heart, spirit, soul; thoughts, ideas;...
2Old Japanese心heart, mind, spirit; emotion, feeling; heart,...
3Proto-Japonic*kəkərəheart

via Japanese を

StepLanguageWordMeaning
1JapaneseをA case particle; A conjunctive particle, usually...
2Proto-Japonicwoaccusative marker; away from, off
Every word from Proto-Japonic *kəkərə →Every word from Old Japanese 心 →Every word from Japanese 心 →
心を配る — Etymology, Origin & Word History | Etymology Explorer