Moses
Numbers 32:1BSB·traditional attribution

Now the Reubenites and Gadites, who had very large herds and flocks, surveyed the lands of Jazer and Gilead, and they saw that the region was suitable 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.