BibTeX:
@incollection{Various,
  author = {Various},
  title = {Kindness to a Former Enemy},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/enemies},
}

APA:
Various. Kindness to a Former Enemy. In *bahaistories.com archive*.

MLA:
Various. "Kindness to a Former Enemy." *bahaistories.com archive*, n.d..

Chicago:
Various. "Kindness to a Former Enemy." In *bahaistories.com archive*, n.d..