His father reported that he saw the Messenger of Allah ﷺ in a red leather tent. He said, "I saw Bilal bring out water left from the Prophet's ablution, and I watched the people rushing toward it. Whoever managed to get some of it wiped himself with it, and whoever could not get any took from the moisture on his companion's hand."
أن أباه رأى رسول الله ﷺ في قبة حمراء من أدم، ورأيت بلالا أخرج وضوءا، فرأيت الناس يبتدرون ذلك الوضوء، فمن أصاب منه شيئا تمسح به، ومن لم يصب منه شيئا أخذ من بلل يد صاحبه.
Bukhari narrated it in the Book of Prayer (376) and Muslim in the Book of Prayer (503:250), both from the hadith of Umar bin Abu Zaida, who said, Awn bin Abu Juhayfa narrated to us, and he mentioned it.As for what was narrated from Umm Ayman, who said, the Messenger of Allah ﷺ got up during the night and went to a clay vessel in a corner of the house and urinated in it. I got up during the night, thirsty, and drank what was in it without realizing. When the Prophet ﷺ rose in the morning, he said, "Umm Ayman, get up and pour out what is in that vessel." I said, "By Allah, I have already drunk what was in it!" The Prophet ﷺ laughed until his molars showed, then said, "You will never suffer a stomach ailment again." This is daif.Tabarani narrated it in Al-Kabir (25/89), and Hakim in Al-Mustadrak (4/63), both from the hadith of Shababa bin Sawwar, who said, Abu Malik Nakhai narrated to me, from Aswad bin Qays, from Nabeeh Anazi, from Umm Ayman, who said, and he mentioned it. Hakim passed over it in silence. Haythami said in Al-Majma (8/271), "It contains Abu Malik Nakhai, who is daif."I say, it is as he said, for Abu Malik Nakhai, who is Wasiti, whose name is Abdul-Malik bin Husayn, is daif by the agreement of the scholars. Daraqutni also faulted it on this basis in Al-Ilal (4106), as did Ibn Hajar in Al-Talkhis (1/31), who added that Nabeeh never met Umm Ayman.Another narration states that her name was Barra, a servant of Umm Salama who came with her from the land of Abyssinia, as Tabarani narrated in Al-Kabir (20/205), from Abdullah bin Ahmad bin Hanbal, who said, Yahya bin Main narrated to us, who said, Hajjaj bin Muhammad narrated to us, from Ibn Jurayj, from Hakeema bint Umayma, from her mother Umayma, who said, the Prophet ﷺ had a wooden cup which he urinated in and placed under his bed. He got up and looked for it but could not find it. He asked, "Where is the cup?" They said, "Barra, the servant of Umm Salama who came with her from the land of Abyssinia, drank it." The Prophet ﷺ said, "You have shielded yourself from the Fire with a shield."Hakeema bint Umayma had no one narrate from her except Ibn Jurayj, as Abu Naeem affirmed with certainty. She is unknown, not recognized. Dhahabi listed her in Al-Mizan among the unknown women, and Ibn Hajar said in Al-Taqrib, "She is not known."Another narration is found with Tabarani (24/189) and Abu Naeem in Al-Marifa (6/3263), both through the route of Hajjaj bin Muhammad, from Ibn Jurayj, who said, Hakeema bint Umayma narrated to me, from her mother Umayma bint Ruqayqa, who said, the Prophet ﷺ used to urinate in a wooden cup, then place it under his bed. He urinated in it, then wanted it, but found nothing in the cup. He said to a woman called Baraka who used to serve Umm Habiba, having come with her from the land of Abyssinia, "Where is the urine that was in the cup?" She said, "I drank it!" He said, "You have shielded yourself from the Fire with a shield."Abdul-Razzaq narrated it in Al-Musannaf, as found in Al-Isaba (11049), from Ibn Jurayj, "I was informed that the Prophet ﷺ used to urinate in a cup..." and he mentioned something similar as a mursal narration.It appears that a corruption occurred here, and the correct reading is that she was Baraka, which is the name of Umm Ayman, the nurse of the Prophet ﷺ. So the statement of whoever said that Baraka used to serve Umm Habiba is an interpretation from one of the narrators, otherwise she is Umm Ayman, and the story did not happen more than once. Had this story been established and repeated, the wives of the Prophet ﷺ would have raced to do this, and after them the companions of the Prophet ﷺ, just as they used to compete over his water of ablution.Then I came across the words of Ibn Abdul-Barr, who related this story in the biographical entry of Baraka, Umm Ayman, and said, "I think this Baraka is the same Umm Ayman mentioned." And Allah knows best.