Do I have to sign any documents when my spouse close on a house?

My spouse is buying a house and closing on it in a few weeks. We met with the lender and she mentioned it's required for me to sign some docs although my name is not going to be on any part of the loan. The lender said I'll have to show up at closing too to sign the doc, which basically states, " I know my spouse is buying a property and not doing it without my consent." This doesn't make sense to me! Have anyone heard of such a thing?

The lender is BMO and I'm not putting my name on anything!

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