Nearing the conclusion of Parshat Yithro, Torah records the high moment to date in world history; The Asseret HaDivrot (The 10 Statements) were given on the 6th day of the month of Sivan. After Hashem presents Moshe and the B’nai Yisrael with The Asseret HaDivrot, he instructs Moshe to fashion the construction of an earthen altar — a Mizbeiyach on which to bring the various offerings to Hashem (Sefer Sh’mot, Perek 20, posuk 21).
R’ Shimshon Rafael Hirsch, z’l in the new Hirsch Chumash (published by Feldheim in 2005 and translated to English by Daniel Haberman), provides commentary on posuk 21 (New Hirsch Chumash, Sefer Sh’mot, Parsha Yithro, Perek 20, posuk 21, page 359):