It is narrated from Hazrat Aisha (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) would perform ablution with about one mudd of water and would perform ghusl with about one sa’ of water.
Hadith Referenceمسند احمد / مسند النساء / 25015
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد ضعيف لأجل النضر بن إسماعيل