And the children of Gad and the children of Reuben answered,...., The word is in the singular number, and shows their unanimity, that they agreed to what Moses said, and replied all of them as one man, as Jarchi expresses it; and it may be there was one that was the mouth of them all, and answered for them:

saying, as the Lord hath said unto thy servants, so will we do; here they make use of the word Jehovah, taking what Moses had said unto them as from the Lord, and therefore should strictly and punctually observe it, as if they heard the Lord himself speak it.

And the children of Gad and the children of Reuben spake unto Moses, saying,.... In answer to his speech:

thy servants will do as my lord commandeth; both with respect to their march before the Lord to battle, and with respect to their provision for their children and flocks.

Next: Numbers Chapter 33

concerning them Moses commanded--The arrangement itself, as well as the express terms on which he assented to it, was announced by the leader to the public authorities. The pastoral country the two tribes had desired was to be granted them on condition that they would lend their aid to their brethren in the approaching invasion of Canaan. If they refused or failed to perform their promise, those possessions should be forfeited, and they themselves compelled to go across the Jordan and fight for a settlement like the rest of their brethren.