I know of no such thing. Sola fide and sola Scriptura would be “central and ubiquitous” but “once saved always saved” is not. While some Protestant traditions do believe in eternal security (notably the Reformed), there are other Protestant traditions who teach conditional security (Arminianism, Lutheranism).
This isn’t Protestantism. It’s Antinomianism. The Westminster Confession of Faith, the gold standard of Calvinist theology, states in Chapter 19 Of the Law of God:
V. The moral law does forever bind all, as well justified persons as others, to the obedience thereof; and that, not only in regard of the matter contained in it, but also in respect of the authority of God the Creator, who gave it. Neither does Christ, in the Gospel, any way dissolve, but much strengthen this obligation.
VI. Although true believers be not under the law, as a covenant of works, to be thereby justified, or condemned; yet is it of great use to them, as well as to others; in that, as a rule of life informing them of the will of God, and their duty, it directs and binds them to walk accordingly; . . .
VII. Neither are the forementioned uses of the law contrary to the grace of the Gospel, but do sweetly comply with it; the Spirit of Christ subduing and enabling the will of man to do that freely, and cheerfully, which the will of God, revealed in the law, requires to be done.