Ms. Mohajir said educating Muslim women about sexual health could make people so uncomfortable that she did not talk about her job with some family members. Getting her programs accepted in mosques has been difficult, she said, and fund-raising is “incredibly challenging.”

Mr. Mozaffar said he had ultimately brokered a settlement in which Mr. Saleem signed a handwritten document saying he had apologized and “admitted to his actions.” But the document does not specify what actions. Mr. Saleem indicated that he was apologizing for the sin of zina, or consensual extramarital sexual contact, Mr. Mozaffar said.

That agreement was supposed to end things, but word spread through the community, and Mr. Mozaffar addressed them on his blog, writing that it was “public knowledge” what Mr. Saleem had done and that he had “admitted the details to me, face to face.”

Angry commenters accused him of undermining Mr. Saleem. “Dear brothers and sisters this matter does not concern you,” one wrote. “Regardless if the allegations are true or false he is a much better Muslim than all of us. Please stop spreading information regarding him. He has reached a very old age. You should be instead focusing on how you can spend more time in his presence.”

Mr. Mozaffar deleted his post, but not before two women in their 40s saw it and told advocates that Mr. Saleem had abused them in the early 1980s, when he was teaching from his bedroom. One woman said Mr. Saleem began touching her when she was 12. Once, she said, he sat on a bed, covered in a brown blanket, and put her hand on his genitals while he taught her a chapter of the Quran called al-Qari’a, about the Day of Judgment when people will be held to account for their good and evil deeds.