BibTeX:
@incollection{Various,
  author = {Various},
  title = {The Master's concern for others endured to the very end of His earthly life},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/exhaustion},
}

APA:
Various. The Master's concern for others endured to the very end of His earthly life. In *bahaistories.com archive*.

MLA:
Various. "The Master's concern for others endured to the very end of His earthly life." *bahaistories.com archive*, n.d..

Chicago:
Various. "The Master's concern for others endured to the very end of His earthly life." In *bahaistories.com archive*, n.d..