I have found: this is spoken of God figuratively after the manner of men, to imply the great scarcity of such persons, and the difficulty of finding them out.
With my holy oil; both. with material oil, 1Sa_16:132Sa_5:3, and with the gifts and graces of my Holy Spirit, which are oft signified by oil or unction, as Psa_45:7, compared with Heb_1:9Isa_61:31Jo_2:20,27.