This wording is authentically reported from her. Al-Qasim ibn Muhammad narrated from her that she said:

“When the two circumcised parts meet, ritual bathing becomes obligatory. The Messenger of Allah, peace and blessings be upon him, and I did so.”

Al-Tirmidhi (1/23) and Ibn Majah (608) narrated it from her with an authentic chain of transmission. Muslim (1/187) and others also narrated it through another route from her, traced back to the Prophet, peace and blessings be upon him, as a statement of his, with similar wording. Al-Khatib likewise narrated it in his History (12/286) through a third route from her, traced back to the Prophet, with the wording cited in the heading.

2. As for the hadith of Ibn Amr, Amr ibn Shuayb narrated it from his father, from his grandfather, attributed to the Prophet with the same wording. Ibn Majah (611), Ahmad (2/178), and al-Khatib (1/311 and 6/283) narrated it through various routes from him. Its chain of transmission is good. The first two added: “and the glans is completely concealed.” Their chain includes al-Hajjaj ibn Artah, who practised tadlis and narrated it using an ambiguous “from” formulation. Abdullah ibn Buzay narrated it in corroboration of him, from Abu Hanifah, from Amr ibn Shuayb, with the same report. He added at its end: “whether he ejaculated or not.”