Numbers 10:29-33

29Now Moses said to Hobab son of Reuel the Midianite, Moses’ father-in-law, “We are setting out for the place about which the Lord said, ‘I will give it to you.’ Come with us and we will treat you well, for the Lord has promised good things to Israel.”

30He answered, “No, I will not go; I am going back to my own land and my own people.”

31But Moses said, “Please do not leave us. You know where we should camp in the wilderness, and you can be our eyes.

32If you come with us, we will share with you whatever good things the Lord gives us.”

33So they set out from the mountain of the Lord and traveled for three days. The ark of the covenant of the Lord went before them during those three days to find them a place to rest.