A cleansing agent that in biblical times probably used olive oil as the fat and some salt-bearing plants as the alkali source. In the Bible soap is used of cleaning both the body (Jer 2:22) and clothes (Mal 3:2).

Jer 2:22

22Though you wash yourself with lye
and use much soap,
the stain of your guilt is still before me,
says the Lord GOD.

Mal 3:2

2But who can endure the day of his coming, and who can stand when he appears?
For he is like a refiner's fire and like fullers' soap;

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