What happens if I link to a good page that later becomes spammy?

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Published on May 21, 2012 8:53:46 PM ● Video Link: https://www.youtube.com/watch?v=1yk1VktvGg8

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Site A links to Site B because Site B has content that would be useful to Site A's end users, and Google indexes the appropriate page. After the page is indexed, Site B's content changes and becomes spammy. Does Site A incur a penalty in this case? MrTVTL, Toronto

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