John Gill Commentary Joshua 22:15

"And they came unto the children of Reuben, and to the children of Gad, and to the half-tribe of Manasseh, unto the land of Gilead, and they spake with them, saying," — Joshua 22:15 (ASV)

And they came unto the children of Reuben, and to the
children of Gad, and to the half tribe of Manasseh, unto the land of
Gilead
The deputation came thither; they either sent for the chiefs among the two tribes and a half, to meet them at some place, or they, having a notion of their coming, assembled together to receive them, and hear what they had to say to them:

and they spoke with them, saying ;
as follows; very probably Phinehas was the mouth of the whole, for there could be but one speaker.