Commentaries:
Adam Clarke
    The  chief  of  all  the  people - The corners pinnoth ; for as the corner-stones are the strength of the walls, so are the chiefs the strength of the people. Hence Christ is called the chief corner-stone.
    In  the  assembly  of  the  people  of  God - The Septuagint translate, And all the tribes of Israel stood up before the face of the Lord, ͅ , in the Church of the people of God. Here was a Church, though there was no priest; for, as Tertullian says,  Ubi tres, ecclesia est, licet laici  ; "Wheresoever three are gathered together in the name of the Lord, there is a Church, although there be none but the laity." 
Other Adam Clarke entries containing Judges 20:2:
Joshua 18:26
 
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