שֶׁלֹּ֤א מִלֵּ֖א כַפּ֥וֹ קוֹצֵ֗ר וְחִצְנ֥וֹ מְעַמֵּֽר׃
Wherewith the reaper filleth not his hand, Nor he that bindeth sheaves his bosom.
Rashi on Psalms
his arm Like (Isa. 49:22): “and they will bring your sons in [their] arms (בחצן),” aisselle in French, and so (Neh. 5:13): “Also I shook out my arm (חצני).”