Exodus 23:5

If thou see the ass of him that hateth thee lying under his burden, borne down to the ground by the greatness of the load upon him, and wouldest forbear to help him, thou shalt surely help with him, literally: "Wouldest thou hold back from helping?" Surely no man's feeling of revenge would reach the point of permitting a dumb beast to suffer. There is only one thing to do in such an extremity: relieve the beast of its load, help him to arise, assist his master in saving the burden. That such conduct requires self-denial is implied, but the Lord wants such self-denial to be practiced.