Deuteronomy 28:9

holy See Deuteronomy 7:6, and note on Holiness, p. 108. Here (as the context shows) the meaning is not ethical, but = set apart for Himself, therefore inviolate; cp. Jeremiah 2:3.

if thou shalt keep Rather, for (ex hypothese) thou wilt be keeping. Cp. Dri.; Marti.: in case thou shalt. So there is no need to omit the clause with Steuern. and Staerk.