Tisri
Tisri (Tishri) was the first month of the Jewish civil year and the seventh month of the sacred (ecclesiastical) year, corresponding approximately to September-October. It is also called Ethanim in the older nomenclature (1 Kings 8:2). The dedication of Solomon's temple took place "in the month Ethanim, which is the seventh month" (1 Kings 8:2), marking Tisri as a month of supreme religious significance.
Tisri was the most ceremonially dense month in the Hebrew calendar, containing three major observances: the Feast of Trumpets on the first day (Num. 29:1; Lev. 23:24), the Day of Atonement on the tenth day (Lev. 23:27), and the Feast of Tabernacles beginning on the fifteenth day (Lev. 23:34). The concentration of these major observances in a single month made Tisri the spiritual climax of the Israelite year, centering on repentance, atonement, and joyful celebration of God's provision.