Keep away from the devoted things

Joshua 6:1-21
The seven priests carrying the seven trumpets before the Lord went forward, blowing their trumpets, and the ark of the Lord’s covenant followed them. he armed guard marched ahead of the priests who blew the trumpets, and the rear guard followed the ark. Joshua had commanded the army, “Do not give a war cry, do not raise your voices, do not say a word until the day I tell you to shout. Then shout!”
March around the city once with all the armed men. Do this for six days. On the seventh day, march around the city seven times, with the priests blowing the trumpets.
The city and all that is in it are to be devoted to the Lord. Only Rahab the prostitute and all who are with her in her house shall be spared, because she hid the spies we sent. But keep away from the devoted things, so that you will not bring about your own destruction by taking any of them. Otherwise you will make the camp of Israel liable to destruction and bring trouble on it.
The city of Jericho has an incredibly long history of building and destruction.
Devoted things/under a ban: The city and all its contents are dedicated utterly to God. It becomes sacrilege then, for anyone to take anything for themselves.

Why?

It was a war of nerves for the men of Jericho; day after day the encircling troops, the trumpet-blasts, the silent army, building up to the great climax of the seventh day.
Seven is the number of completeness and perfection. Used 735 times (54 times in the book of Revelation alone), the number 7 is the foundation of God's word. If we include with this count how many times 'sevenfold' (6) and 'seventh' (119) is used, our total jumps to 860 references.
Do not take anything that be devoted to the Lord, such as tithe.
How?
Be humble, do not take the honor of the Lord, give honor to God, He is my Lord!