Moses
Leviticus 23:39ESV·traditional attribution

“On the fifteenth day of the seventh month, when you have gathered in the produce of the land, you shall celebrate the feast of the LORD seven days. On the first day shall be a solemn rest, and on the eighth day shall be a solemn rest.

Matthew Henry Presbyterian @wholebiblehenry

We have here, I. The institution of the feast of tabernacles, which was one of the three great feasts at which all the males were bound to attend, and celebrated with more expressions of joy than any of them. 1.

Commenting on Leviticus 23:33-44

John Gill Reformed Baptist @doctorgill

Also in the fifteenth day of the seventh month,.... The month Tisri or September, the same month, and the same day of the month before observed; only another end and use of this feast is remarked, which was to give thanks for the fruits of the earth gathered in, as follows: when ye have gathered in the fruit of the land; the barley, wheat, oil...

Geneva Bible Notes Reformed @genevanotes

Also in the fifteenth day of the seventh month, when ye have gathered in the fruit of the land, ye shall keep a feast unto the LORD seven days: on the first day [shall be] a sabbath, and on the eighth day [shall be] a sabbath. (r) Or, a solemn feast.