Hadith 214
Ubayy bin Kaab reported: The Messenger of Allah ﷺ made a concession in the early days of Islam on account of the paucity of clothes that one should not take a bath if one has sexual intercourse (and has no seminal emission). But later on her commanded to take a bath in such a case and prohibited its omission.
Hadith 215
Ubayy bin Kaab said: The verdict that water (bath) is necessary when there is emission given by the people (in the early days of Islam) was due to the concession granted by the Messenger of Allah in the beginning of Islam. He then commanded to take a bath (in such a case). Abu Dawud said: By Abu Ghassan is meant Muhammad bin mutarrif.
Hadith 216
Abu Hurairah reported the Prophet ﷺ as saying: when anyone sits between the four parts of a woman and the parts (of the male and female) which are circumscised join together, then bath becomes obligatory.
Hadith 217
Aba Saeed al-Khudri reported: The Messenger of Allah ﷺ said: water (bath) is necessary only when there is seminal emission. And Abu Salamah followed it.