Islamic law forbids extravagance and Allah warns those following this behavior. Extravagance is the excessive usage of anything. A Muslim should be economical even when using water in ablution or bathing. In this hadith, Safina, the companion and servant of the Prophet, confirmed that the Prophet (ﷺ) used to bathe, due to intercourse, with one sa' (eight water handfuls). Sa’ equals eight pounds. A pound in modern quantities is about 380 or 538 grams. It is a little less or more than a liter. Additionally, the Prophet (ﷺ) used to perform ablution with one mudd (two handfuls of water). This hadith shows the amount that sufficed him, not the amount that a person cannot exceed, for people vary in using water for ablution or bathing. Anyway, using water extravagantly is forbidden in Islam that commands its followers to preserve and wisely use water resources as needed..