Wilson's Dictionary of Bible Types
Matthew 13:30 (a) The Lord tells us plainly in this passage that "the reapers are the angels." In the day when GOD will judge the earth, He evidently will send forth His angels and will separate the Christians, genuine believers, real born-again saints, from the great multitude of the unsaved, the ungodly, religious hypocrites. No one could do this but an angel. No one else can discern the true condition of the heart.
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Watson, Walter. Entry for 'Reaper'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/r/reaper.html. 1957.