Deuteronomy 31:10
And Moses commanded them, saying, At the end of every seven years, in the solemnity of the year of release, in the feast of tabernacles,
Cross-reference
Deuteronomy 15:1 defines the 'year of release' as the sabbatical year for debt forgiveness, which is the same period referenced here for reading the law.
Deuteronomy 15:2 details the manner of release in the sabbatical year, the very release that marks the time for this public reading.
Deuteronomy 16:13 repeats the command for the Feast of Booths, linking it to harvest, the same feast mentioned here.
Leviticus 23:34-43 institutes the Feast of Booths, the festival during which this public reading of the law is commanded to occur.
Leviticus 23:43 explains the purpose of the Feast of Booths — remembering God's dwelling in booths — which is the context for this law reading.
Nehemiah 8:18 describes daily reading of the law during the Feast of Tabernacles, directly fulfilling the command to read at that feast.
Zechariah 14:16 prophesies all nations celebrating the Feast of Tabernacles, extending the command to a future universal observance.
In Joshua 8:34, Joshua reads the Book of the Law publicly, exemplifying the public reading Moses here commands every seventh year at the Feast.
Exodus 21:2 commands release of Hebrew slaves in the seventh year, illustrating the broader sabbatical-year system that includes the 'year of release' here.
2 Kings 23:2 records Josiah reading the law publicly, echoing the commanded public reading every seven years.
Nehemiah 8:2 shows Ezra reading the law on the first day of the seventh month, a similar public reading but not explicitly at the Feast of Tabernacles.