Reference for Berakhot 119:5
R. Johanan can reply to thee : It is obvious that according to R. Judah, if a man made a purchase and then a fresh purchase, he also must say a benediction [for the latter]; but the point of variance [between R. Judah and R. Meir] is where the man already possessed the article and made a fresh purchase, to show the extreme view taken by R. Meir; for even if he made a purchase, already possessing a similar article, there is no necessity for a benediction, how much more unnecessary is it if he purchased and then made a fresh purchase.
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