salted with fire

The Greek that is translated in English “(Everyone will be) salted with fire” is translated in Uripiv as “God will test all people with fire, like they test black stones [which are used in cooking]. If a stone is no good, it crumbles to ashes; if it’s good, the fire doesn’t affect it. So also they put salt with food to test its flavour, good or bad.” (Source: Ross McKerras)

See also complete verse (Mark 9:49).