they that were called i.e. -chosen" to help Moses in conducting the census.

their fathers Their ancestors, the sons of Jacob.

thousands Another term for a group of relations, irrespective of its exact number; it is probable that it denotes a large group such as a clan, rather than a small group such as a -fathers" house" (Numbers 1:2); cf. Judges 6:15; 1 Samuel 10:19; 1 Samuel 10:21; Micah 5:2.

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