לא תתגודדו, as described in Kings I 18,28 ויתגודדו כמשפטם בחרבות וברמחים, “they gashed themselves with swords and daggers.” The word is also used for cutting down trees (Sanhedrin 110)

למען תלמד ליראה, when you are an eyewitness to the priests performing their service in the Temple, etc., the site at which G’d’s presence manifests itself.

והלוי אשר בשעריך לא תעזבנו, but let him share in your joy so that G’d in turn will have reason to be good to you.

מקצה שלש שנים, the year in which the tithe for the poor is due.