How I Met Your Mother Finale Sneak Peek: Welcome, Robin

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Before we're forced to deal with a future that does not include How I Met Your Mother, let's take a look into the past, shall we?

Courtesy of Entertainment Tonight, we have our first look at Monday's series finale, as Ted, Marshall and Lily think back to when they inducted Robin into their clique - and Lily came up with one golden rule for the guys.

What was it? And how did Barney actually end up heeding it? Watch and learn now:

In anticipation over theĀ How I Met Your Mother Season 9 finale, and the completion of Ted's story, we're also delving into the past in the following photo gallery.

Relive the most memorable near Mothers now:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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