How much water suffices a person in a state of janabah for his ghusl?

Sayyiduna Safinah (may Allah be pleased with him) said: "The Messenger of Allah (peace and blessings be upon him) used to take the ritual bath (ghusl) with one sa' of water and perform ablution (wudu) with one mudd of water."

Sayyidah Aishah (may Allah be pleased with her) said: "The Messenger of Allah (peace and blessings be upon him) used to take the ritual bath (ghusl) from a vessel called the faraq, which is the qadah (a large drinking vessel)."

Sayyiduna Jabir (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: "One mudd of water suffices for ablution (wudu), and one sa' for the ritual bath (ghusl)." A man asked: "O Jabir! How much is enough for us?" He said: "As much as was enough for one who was better than you and had more hair than you, that is, the Prophet (peace and blessings be upon him)."

A man narrated: I asked Sayyidah Aishah (may Allah be pleased with her): "How much water did the Prophet (peace and blessings be upon him) use for his ritual bath (ghusl)?" Sayyidah Aishah (may Allah be pleased with her) showed a vessel which was approximately equal to one sa'.

Sayyiduna Anas (may Allah be pleased with him) said: "Perform ablution (wudu) with one mudd of water, and take the ritual bath (ghusl) with one sa' up to five mudds of water."

Sayyiduna Jabir (may Allah be pleased with him) was asked about the ritual bath from major impurity (janabah): how much water suffices for it? He said: "One sa'." Then it was asked: "I do not think that will be enough for me." He said: "It will be enough."

Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: "One sa' of water suffices for a person in a state of major impurity (junub)." Ubaydullah said: "I do not know whether this one sa' is meant before the ablution (wudu) or after it."

Abu Ja'far said: "The Messenger of Allah (peace and blessings be upon him) used to perform ablution (wudu) with one mudd of water and take the ritual bath (ghusl) with one sa' of water."

Something similar is reported from Sayyidah Aishah (may Allah be pleased with her).

Atiyyah said: I saw Sayyiduna Ibn Umar (may Allah be pleased with them both) performing ablution (wudu) from a jug, and he left some of its water over. I asked: "Would that be one mudd of water?" He said: "It was more than that."

Al-Hasan said: "The Companions considered one mudd of water sufficient for ablution (wudu) and one sa' for the ritual bath (ghusl)."

Ibrahim said: "It used to be said: a quarter of a faraq suffices a man for his ritual bath (ghusl)."