Sforno on Exodus 22:4/ספורנו על שמות כ״ב:ד׳

1כי יבער איש שדה או כרם, within his own property, (originally)

2ובער בשדה אחר, even if the animal had wandered off into someone else’s field without encouragement by its owner,

3מיטב שדהו ומיטב כרמו ישלם, the quality of the restitution must consist of the best of the field or vineyard, seeing that animals wandering off to feed elsewhere is such a widespread phenomenon. [the author explains the apparent injustice of the restitution being worth more than the damage the injured party had sustained. Ed.]