It is narrated from Hazrat Safina (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) used to perform ghusl with one sa’ of water and wudu with one mudd of water.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 21931
Hadith Gradingحکم دارالسلام:صحيح لغيره، م: 326، وهذا إسناد حسن