NUM266 Advice for a Traveler: Never Drink All That One Brought with Him or Her: When the Israelites came to Edom they said to the King, "Allow us through your land. We will not drink the waters of a well" [this verse]. From this we learn good manners. Even if a person traveling in a strange country has all his own supplies with him, he should not eat and drink what he brought with him. Instead, he should buy what he needs from the local shopkeepers in order to improve trade. What Moses meant when he spoke to the King of Edom was, "We will not drink from the well that we have with us, and we will not eat the manna that has been given us. You won't be able to complain that we were nothing but trouble to you, because we will bring you business [Tanchuma on Numbers, Chukkat, 61b].