Commentary for Berakhot 8:25
אמר ר' יוחנן אתיא אחד אחד כתיב הכא ויעף אלי אחד מן השרפים וכתי' התם (דניאל י, יג) והנה מיכאל אחד (מן) השרים הראשונים בא לעזרני
R. Johanan said : By comparing the occurrence of the word "one" in the following passages: In Isaiah it is written, "Then flew unto me one of the Seraphim," and elsewhere it is written, "But, lo, Michael, one of the chief princes, came to help me" (ibid. x. 13).
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
This argument is known as Gezerah Shawah, "analogy of expression." See Mielziner, pp. 142 ff., especially pp. 148 ff. where the safeguards against the exorbitant use of the argument are explained.
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