신명기 25:2의 주석

והפילו השפט AND THE JUDGE SHALL CAUSE HIM TO FALL DOWN — This teaches that one is not lashed whilst standing or sitting but only when bending (Makkot 22b).

והפילו השופט, he will stretch him out on the post. [The lashes are not applied when the victim is standing upright, but when he is at least inclined. (Makkot 22) Ed.]

אם בן הכות הרשע, "if the person found guilty (the wicked one) is convicted he is to receive 39 lashes, etc." The reason the Torah wrote the word בן with the vowel chirik instead of the customary vowel segol is that he who administers the lashes must evaluate if the victim is physically able to absorb these lashes without injury. In the event that the health of the individual in question cannot absorb the normal number of lashes, i.e. that he is not ben hakkot, he receives only as many lashes as are compatible with maintaining his level of health (compare Makkot 22).