BibTeX:
@incollection{Various,
  author = {Various},
  title = {It happened that during the Baghdad period, the well-known Ilkhani, son of Musa},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/repentance},
}

APA:
Various. It happened that during the Baghdad period, the well-known Ilkhani, son of Musa. In *bahaistories.com archive*.

MLA:
Various. "It happened that during the Baghdad period, the well-known Ilkhani, son of Musa." *bahaistories.com archive*, n.d..

Chicago:
Various. "It happened that during the Baghdad period, the well-known Ilkhani, son of Musa." In *bahaistories.com archive*, n.d..