How to go back to stock?

It's been about a year since I've rooted my phone and I've been wanting to go back to stock for a while now. Anyone have a link that provides the instructions on how to unroot my phone? Still kind of new to the whole rooting process. Thank you.

Update: Sorry, didn't realize how easy it was to find the stock rom. Using the Odin Tar, hoping that's the right one.

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