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The national colours of Israel are blue and white as seen on the flag of Israel. These two national colors represent as patriotism in modern day usage including people and government authorities. However, these colors are not mentioned by law, but they are the national colors in an informal and substantial practice. Blue and white colors decorates many flags, symbols, etc.
Torah
Book of Numbers mentions in 15:38, it says that the Israelites were commanded to put fringes on the corners of their garments, and to put a cord of blue border upon these fringes.
References
National colours of Israel Wikipedia(Text) CC BY-SA