What is the story of Ashwathama cursing Parents of Lord Swaminarayana?
I read it on wikipedia. But I would like to know what is the source of this story? Which Hindu scripture describes this incident?
You can read it in Scripture: Shree Haricharitramrut Sagar, it is in hindi. Shree Haricharitramrut Sagar is the scripture mentioned life events (lila) of Bhagavan Swaminarayan. There are many, but this is the only one I found in hindi.
If you read Pur 1, Tarang 31 to 35. it has all the details you need. Page number 115 to 130. Hope that helps.