Reference for Berakhot 107:8

כל חותמי ברכות שבמקדש היו אומרים עד העולם משקלקלו הצדוקים ואמרו אין עולם אלא אחד התקינו שיהו אומרים מן העולם ועד העולם

"Forever" ; but when the Minim perverted the truth and declared that there is only one world, it was ordained that the wording should be "From everlasting to everlasting." It was further ordained that a man should greet his friends by mentioning the Divine Name ; as it is said,

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