This may mean, “Pay attention and listen, Balak.” Or again, it may simply mean to stand up in a reverent attitude and listen to the message from Jehovah. The first suggestion is the more probable.
Hearken unto me.
The prophet fully realized the import of the message he was constrained to utter, and that without altering a single word. The Hebrew expression suggests not only to listen but to ponder well the import of the message.