Moses
Numbers 32:1ESV·traditional attribution

Now the people of Reuben and the people of Gad had a very great number of livestock. And they saw the land of Jazer and the land of Gilead, and behold, the place was a place for livestock.

John Calvin Reformed @genevareformer

1. Now the children of Reuben and the children of Gad. In this narrative we behold, as in a glass, that whilst each individual is but too attentive to his own private interests, he forgets what is just and right.

John Gill Reformed Baptist @doctorgill

The children of Gad and the children of Reuben came and spake unto Moses,.... The children of Gad are mentioned first, though Reuben was the firstborn, and had a standard under which Gad pitched: it may be, as Aben Ezra thinks, the Gadites were the first authors of this counsel, the contrivers of this scheme; who first moved it to the Reubenites, which they had...

Geneva Bible Notes Reformed @genevanotes

Now the children of Reuben and the children of Gad had a very great multitude of cattle: and when they saw the land of Jazer, and the land of Gilead, that, behold, the place [was] a place for cattle; (a) Reuben came from Leah, and Gad from Zilpah her handmaid.