1 Heb “you must not see,” but, if translated literally into English, the statement is misleading.
2 Heb “brother’s” (also later in this verse). In this context it is not limited to one’s siblings, however; cf. “your kinsman’s.”
3 Heb “hide yourself.”
4 The Hebrew text uses the infinitive absolute for emphasis, which the translation indicates with the words “without fail.”

In other versions

“You shall not see your brother’s ox or his sheep going astray and ignore them. You shall take them back to your brother.

If you see your fellow Israelite’s ox or sheep straying, do not ignore it but be sure to take it back to its owner.

“If you see your brother Israelite’s ox or sheep straying, do not ignore it; make sure you return it to your brother.

“If you see your neighbor’s ox or sheep or goat wandering away, don’t ignore your responsibility. Take it back to its owner.

“You shall not watch the ox of your neighbor or his sheep or goat straying and ignore them; certainly you shall return them to your neighbor.

Thou shalt not see thy brother’s ox or his sheep go astray, and hide thyself from them: thou shalt in any case bring them again unto thy brother.

Public Domain