monotheistical

In Hebrews 1:10-12 we have highly monotheistical description of Godhead from the OT.

HANDS Across the Godhead? James F. McGrath 2010

In 1 Corinthians 8:6 Paul in fact splits at least one monotheistical formula between God and Jesus.

The Only True God In The Review of Biblical Literature James F. McGrath 2009

That the Jewish, but also Judaism-rejecting, philosopher should feel himself obliged also to ignore the history of the human spirit in general, was naturally to be expected; his system (if we except the philosophy of Descartes, which had likewise but little connection with earlier philosophy, and whose monotheistical character Spinoza assails) has no historical antecedents proper, but in fact begins anew the philosophical thought-work from the very beginning, and develops the Pantheistic world-theory so consequentially and undisguisedly as is nowhere else to be found. —

Christian Ethics. Volume I.���History of Ethics. 1819-1870 1873