بِالعَسَى أَنْ تَفْعَلَ

1.
means بِالحَرَى [i. e. It is suitable, fit, or proper, that thou shouldst do such a thing]. (K. [In the CK, and likewise in the TK, erroneously, بالعَسِىِّ and بالحَرِىِّ.])
2.
عَسًا: see article عسو.

Perseus ID: n29158