Deuteronomy 26 - 28

The law of first fruits defined, where the new fruit of the harvest is given to the Lord, and in certain years with Levites and even strangers. God commands that all the people plan to gather at Mount Ebal and Mount Garazim after going into the promised land, and call out in detail all the blessings that God will pour out on them when they obey His laws, and all the curses He will afflict upon them when they refuse to obey His laws. Joshua, and all the people did this in Joshua chapter 8.