민수기 13:17의 주석

עלו זה בנגב GO UP THIS WAY SOUTHWARD — It (the South) was the worst part of the Land of Israel. He bid them spy this out first because such is the way of merchants: they show a prospective purchaser the inferior goods first, and afterwards they show the best (Midrash Tanchuma, Sh'lach 6).

!עלו זה בנגב. Moses wanted them to commence their mission from the very spot the Israelites found themselves in at this time, i.e. in the south of the land of Canaan. He considered that at this point entry into the land of Canaan would not present any difficulty and they would not have to travel around the country inn order to enter from a more distant location.

וישלח אותם משה, Moses sent them on their way, etc. Why did the Torah need to write the first half of this verse; we have heard about this both in verse 3 and in verse 16? Perhaps the verse was meant to tell us that Moses accompanied them a short distance when they departed as this is a halachic requirement. The Torah speaks about לתור to indicate that Moses warned the spies that they were engaged in a dangerous mission.