Exodus 23:5

כי תראה חמור שנאך וגו׳ IF THOU SEE THE ASS OF HIM THAT HATETH THEE etc. — כי here has the meaning of “possibly”, “perhaps”, which is one of the four meanings which the word כי serves to express. The sense of the verse is accordingly the following: Can you possibly see his ass crouching beneath his burden and forbear to help him? (The Hebrew word בתמיה in Rashi means “Say this in the intonation of a question”, and is nothing more than our question mark). עזב תעזב עמו — The root עזב has here the meaning of “helping”. It has a similar meaning in, (Deuteronomy 32:36) “assisted and helped (עזוב)”. Similar also is, (Nehemiah 3:8) “ויעזבו Jerusalem up to the wall” — i. e. they filled it up with earth in order to help and to support the strength of the wall. A similar use of כי is, (Deuteronomy 7:17, 18) כי תאמר בלבבך רבים הגוים האלה וגו׳ which means “Canst thou possibly (כי) speak thus? לא תירא מהם, Do not be afraid of them and speak thus”. Our Rabbis expounded it in a Halachic sense as follows: … כי תראה וחדלת “If thou seest etc. …וחדלת” — there are occasions when you may forbear and there are occasions when you must help. How so? If it is an old man who sees the ass in this condition and it is not compatible with his dignity to intervene, then וחדלת “thou mayest forbear” holds good; or if the animal belongs to a heathen and its burden to an Israelite then, also, וחדלת may be applied (cf. Mekhilta). עזב תעזב עמו THOU SHALT SURELY HELP HIM — to unload the burden (Mekhilta). Onkelos also translates it in this sense: מלמשקל ליה which means, [Thou shalt not keep back] from taking the load from off it.

כִּֽי־תִרְאֶ֞ה חֲמ֣וֹר שֹׂנַאֲךָ֗ רֹבֵץ֙ תַּ֣חַת מַשָּׂא֔וֹ וְחָדַלְתָּ֖ מֵעֲזֹ֣ב ל֑וֹ עָזֹ֥ב תַּעֲזֹ֖ב עִמּֽוֹ׃ {ס}        

If thou see the ass of him that hates thee lying under its burden, and wouldst forbear to unload it, thou shalt surely unload it with him.