'Unrighteous Mammon' in the Bible

And I tell you [learn from this], make friends for yourselves [for eternity] by means of the wealth of unrighteousness [that is, use material resources as a way to further the work of God], so that when it runs out, they will welcome you into the eternal dwellings.

If therefore ye have not been faithful in the unrighteous mammon, who will commit to your trust the true riches?