Leviticus 23:24,25
Speak to the children of Israel, saying, In the seventh month, in the first day of the month, shall you have a sabbath, a memorial of blowing of trumpets, an holy convocation.
Nave's Topical Index—AKJV

Numbers 29:1-6
And in the seventh month, on the first day of the month, you shall have an holy convocation; you shall do no servile work: it is a day of blowing the trumpets to you.
Nave's Topical Index—AKJV