RobH_en_tn/deu/14/28.md

every three years you will present all the tithe of your produce

Once every 3 years the Israelites were to store their tithes within their own towns so that it would be used to provide for the Levites, orphans, widows and foreigners. (See: rc://en/ta/man/translate/translate-numbers)

within your gates

Here "gates" represents the entire city or town. Alternate translation: "inside your city" (See: rc://en/ta/man/translate/figs-synecdoche)