Using the verses below, which discuss the rights of the Amonite people and the names of their cities, Rashi clarifies that The border city of Amon was named brazen because Amon is protected by prophecy. The protection by prophecy confers a brazen status on this border city - the people are assured it will not leave them. Read the verses yourself and experience the joy of independently deriving the Rashi comment.

Target Verse	Text	Cross Reference	Text	Rashi Comment
Nu21-24a	And Israel smote him with the edge of the sword, and possessed his land from the Arnon unto the Jabbok, even unto the children of Ammon; for the name of the border of the Amonites is brazen.	Dt02-17:19	HaShem spoke unto me saying: and when thou comest nigh over against the children of Ammon, harass them not, nor contend with them; for I will not give thee of the land of the children of Ammon for a possession; because I have given it unto the children of Lot for a possession.--	God prophetically protects Amon. Therefore its border city is named brazen because it can't be taken away from them.

Further Resources: The above table clearly shows the Rashi reference method. The meaning of the studied target verse is clarified by the cross reference. The underlined phrases hilight what is clarified. The Rashi comment column summarizes the illumination of the underlined words through the cross referenced verses. If you as a teacher, teacher aid, Rabbi, or student wish to review other examples of the reference method visit http://www.RashiYomi.com/reference-question.htm and http://www.RashiYomi.com/reference-question.htm.