Srimad Bhagavatam Canto 10, Chapter 64, Text 35

SB 10.64.35

brahma-svam duranujñatam
 bhuktam hanti tri-purusam
prasahya tu balad bhuktam
 dasa purvan dasaparan
 
Translation: 
 
If a person enjoys a brahmana’s property without receiving due permission, that property destroys three generations of his family. But if he takes it by force or gets the government or other outsiders to help him usurp it, then ten generations of his ancestors and ten generations of his descendants are all destroyed.
 
Purport: 
 
According to Srila Sridhara Svami, tri-purusa refers to oneself, one’s sons and one’s grandsons.
Srimad Bhagavatam Canto 10, Chapter 64, Text 34
Srimad Bhagavatam Canto 10, Chapter 64, Text 36