By them — Or, among them: whereby they came to the knowledge of their counsels. Tho' these had not zeal enough to help in the work, yet they had some concern for their brethren. Ten tribes — Very often, a certain number for an uncertain. Be upon you — They will invade you every way, by which we can come to you, or you to us; therefore keep watches on every side.
Related Commentaries of Nehemiah 4:12
Nehemiah 4:12
12 And it came to pass, that when the Jews which dwelt by them came, they said unto us ten times, From all places whence ye shall return unto us they will be upon you.