What is Rosh Chodesh
By observing Rosh Chodesh, we “invite” God into the entire month and make Him Lord over all “our” time. The observance of Rosh Chodesh starts with, “This month will mark the beginning of months for you; it is to be the first month of the year for you” (Exodus 12:2). In response to this text, the Midrash notes, “‘For You’, God said to Israel, ‘Until now, the sanctification of months was in My hands, from now on it is given to you.’” The first and critical part of Rosh Chodesh observance is the sanctification of the month. As a general principle, sanctification or holiness means “set apart,” and in biblical thought, set apart to God.