The Exercise in all probability derives through the story of Sati, Shiva’s previous spouse. It's now outlawed, but there are still accounts of sati taking place, especially in additional distant villages. सागर मध्य कमल हैं जैसे ॥ कार्तिक श्याम और गणराऊ । A number of texts which include Atharvashiras Upanishad https://www.youtube.com/shorts/BvYMU70kIQ4