We bought land from a woman recently. Her exhusband gifted her the property before their divorce. He is claiming they had a verbal agreement not to se

I'm not familiar with Louisiana law, but I know it is a little idiosyncratic.  However, I'm pretty sure that Louisiana will follow the general law in this area, which is that, since you had no reason to know of any claim on the land when you bought it, you are what's known as bona fide purchasers for value, and should not have to worry about losing  the land, whatever was the private agreement between your seller and her ex.  The answer would be different if the seller had told you about the claim, or the exhusband had recorded it, before you bought.