there are two gemaras that i know off the top of my head dealing with it 1 is the gemara in berachos that says if someones worried about ayin hara he should say i’m a descendant of yosef hatzadik which ayin hara has no power over (says as a general statement even though might not be a descendant)
the second gemara i’m just learning in bava basra that one neighbor can force the other neighbor to help him build a wall between their two properties b/c he’s afraid of hezek ayin which some meforshim say is maaris ayin (others say it means wants privacy)