What is the biblical basis for the belief in generational curses?

I've been watching testimonies of people who claim to have been involved in deliverances and spiritual warfare, and the concept of ***generational curse*** is brought up quite often. It's even taught as a doctrine in certain churches (e.g. see this [Hungry Generation's sermon](https://youtu.be/LLRlbx6qzEQ)) . In simple words, a generational curse basically means that some ancestor messed up (e.g. by dabbling into witchcraft, by practicing the occult, by doing some terrible sin, etc.) and, thus, gave to the dark side a legal right to influence them and their descendants in some manner, until the right gets eventually revoked (if ever) by someone down the lineage. What is the biblical basis for this belief?