Wilson's Dictionary of Bible Types
Isaiah 30:28 (a) The Lord promised in this passage that He would strain out the nations in such a way that all their boastings, pride and vain glory would prove to be of no value whatever, and would not stand His testings and siftings. The Lord thus describes the helplessness of the proud enemies of Israel.
Amos 9:9 (a) In this promise the Lord assures Israel that He will put them through severe testings and will remove all that is not profitable nor righteous nor good from among them, but He will keep the people eventually for Himself. In the final checkup, those of Israel who remain on the earth will hear the Word of GOD and believe His message. (See Romans 11:26).
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Watson, Walter. Entry for 'Sieve'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/s/sieve.html. 1957.