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This question already has an answer here:

Could anyone explain the role of resistor R1 in the circuit below?

Thank you.

enter image description here

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marked as duplicate by dim, Bimpelrekkie, Tom Carpenter, PeterJ, tcrosley Jun 16 '16 at 15:01

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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The input signal to the op amp might "see" frequency dependent impedance behavior... This can be caused by circuit parasitics or other known elements such as long feeding leads.

Thus in order to establish more predictable response this resistance will be needed.

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