The Pulpit Commentary - Ezra 3:1
When the seventh month was come. The seventh month was Tisri, and corresponded nearly to our October. It was the most sacred month of the Jewish year, commencing with a blowing of trumpets and a holy convocation on the first day (Le 23:24), which was followed on the tenth day by the solemn day of atonement (ibid. verse 27; comp. Le 16:29-34), and on the fifteenth day by the feast of tabernacles or "ingathering," one of the three great annual festivals, which lasted to the twenty-second... read more
Adam Clarke's Commentary on the Bible - Ezra 3:4
They kept also the feast of tabernacles , as it is written - This began on the fifteenth day of the seventh month; but they had begun the regular offerings from the first day of this month, Ezra 3:6 . And these were religiously continued all the time they were building the temple. read more