The Twelve Spies
In the Book of Numbers, The Twelve Spies (Hebrew: שנים עשר המרגלים) were a group of Israelite chieftains, one from each of the Twelve Tribes, who were dispatched by Moses to scout out the Land of Canaan for 40 days during the time the Israelites were in the desert. The account is found in Numbers 13:1-14:9.
God had promised Abraham that there would be a Promised Land for the nations to come out of his son, Isaac. The land of Canaan which the spies were to explore was the same Promised Land. When ten of the twelve spies told lies about the land, they were slandering what they believed God had promised them. They did not believe that God could help them, and the people as a whole were persuaded that it was not possible to take the land. As a result, the entire nation was made to wander in the desert for 40 years, until almost the entire generation of men had died. Joshua and Caleb were the two spies who brought back a good report and believed that God would help them succeed. They were the only men from their generation permitted to go into the Promised Land after the time of wandering.
About the Spies 
God had promised the Israelites that they would be able to conquer the land with its incumbent Canaanite nations. Moses instructed the spies to report back on the agriculture and lay of the land. During their tour, however, the spies saw fortified cities and resident giants, which frightened them and led them to believe that the Israelites would not be able to conquer the land as God had promised. Ten of the spies decided to bring back a false report, emphasizing the difficulty of the task before them.
They gave Moses this account, "We went into the land to which you sent us, and it does flow with milk and honey! Here is its fruit.But the people who live there are very powerful, and the cities are fortified and very large. We even saw descendants of Anak there."
— Numbers 13:27-28
Two of the spies — Joshua and Caleb — did not go along with the majority and tried to convince the Israelites that they could conquer the land. However, the Israelites believed the majority's conclusions. All of the spies except Joshua and Caleb were struck down with a plague and died.
"Then Caleb silenced the people before Moses and said, 'We should go up and take possession of the land, for we can certainly do it.'"
— Numbers 13:30
Joshua was at first a fierce warrior. He was chosen to as the representative from his tribe, Ephraim, to explore the land of Canaan, and was in agreement with Caleb that the Promised Land could be conquered. After the incident with the 12 spies, Joshua lived through the 40 year wandering period, and was named successor to Moses as instructed by God. Joshua completed the task of leading the Israelites into the Promised Land and of taking possession of it. Joshua also was the leader in renewing the Mosaic covenant with their God.
Caleb was from the tribe of Judah. He was also chosen to explore the land of Canaan, and he was (along with Joshua) the other man who said that the God of the Bible could help the Israelite people to victory against the Canaanites. God promised Caleb and Joshua that they would receive the land which they had explored for themselves and their descendants. Caleb was also told that he would live to go into the Promised Land.
The names of the twelve spies were:
- Shammua son of Zaccur, from the tribe of Reuben
- Shaphat son of Hori, from the tribe of Simeon
- Caleb son of Jephunneh, from the tribe of Judah
- Igal son of Joseph, from the tribe of Issachar
- Hoshea (Joshua) son of Nun, from the tribe of Ephraim
- Palti son of Raphu, from the tribe of Benjamin
- Gaddiel son of Sodi, from the tribe of Zebulin
- Gaddi son of Susi, from the tribe of Manassah
- Ammiel son of Gemalli, from the tribe of Dan
- Sethur son of Michael, from the tribe of Asher
- Nahbi son of Vophsi, from the tribe of Naphtali
- Geuel son of Maki, from the tribe of Gad
Some people think the word "spies" is an incorrect translation. In Chapter 13 of Numbers, the Hebrew word describing the group is the word usually translated as 'men' or the word usually translated as 'princes'. In addition, the twelve were clearly not trained as spies, nor did they conduct any covert activity nor did they enlist any indigenous people for later help. Thus the phrase "Twelve Scouts" or "Twelve Observers" might be an alternate way of describing the group.
The Israelites' belief of the false report amounted to the acceptance of lashon hara (slander) against the Land of Israel.
"But the men who had gone up with him said, 'We can't attack those people; they are stronger than we are." And they spread a bad report about the land they had explored. They said, "The land we explored devours those living in it. All the people we saw there were of great size. We saw the Nephilim there (the descendants of Anak come from the Nephilim). We seemed like grasshoppers in our own eyes, and we looked the same to them.'"
— Numbers 13:31-33
This was considered a grave sin by God. Corresponding to the 40 days that the spies toured the land, their God decreed that the Israelites would wander in the wilderness for 40 years as a result of their unwillingness to take the land. Moreover, the entire generation of men who left Egypt during the Exodus would die in the desert, save for Joshua and Caleb who did not slander the land. For 40 years the Israelites wandered in the desert, eating quail and manna. They were led into the Promised Land by Joshua; the victory at Jericho marked the beginning of possession of the land. As victories were won, the tracts of land were assigned to each tribe, and they lived peacefully with each other. the God of the bible brought victories where needed, and his promise to Abraham was fulfilled.
Tisha B’Av 
According to Rabbinic tradition (as seen in the Mishnah Taanit 4:6), the sin of the spies produced the annual fast day of Tisha B'Av. When the Israelites accepted the false report, they wept over the false belief that God was setting them up for defeat. The night that the people cried was the ninth of Av, which became a day of weeping and misfortune for all time.
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- Numbers 14:30; Dummelow, J.R. The One Volume Bible Commentary. 1950. Macmillan Company. pp.107-108
- Numbers 14:20-31; Caleb, and Joshua, in Freeman, David Noel. The Anchor Bible Dictionary Volume 1 A-C and Volume 2 (H-J). 1992. Doubleday Publishing Group. ISBN 0-385-19351-3, pp.808-809
- Numbers 13:26-33; Wigoder, Geoffrey. Illustrated Dictionary and Concordance of the Bible. 1986. The Jerusalem Publishing House. ISBN 0-89577-407-0, pp.563-564
- Numbers 13:30
- Numbers 14:36-38; Clarke, Adam. Commentary on the Holy Bible. 1967. Beacon Hill Press. SBN 081023211, p.189
- Numbers 14:20-31; Joshua, Freeman, David Noel. The Anchor Bible Dictionary Volume 2 H-J. 1992. Doubleday Publishing Group. ISBN 0-385-19360-2, p.999
- Numbers 14:20-31; Caleb, Freeman, David Noel. The Anchor Bible Dictionary Volume 1 A-C. 1992. Doubleday Publishing Group. ISBN 0-385-19351-3, pp.808-809
- The Holy Bible, New International Version, Zondervan, 1984, LOC 73174297, pp.104-105
- Mishna Taanit 4:6 read online; Orthodox Union page on Tisha B'Av. Retrieved 5 February 2011.
- Numbers 13