A Brief Exposition of New Church Doctrine #36
36. That a trinity of Gods is contrary to Holy Scripture is well known, for it is written:
Am not I Jehovah? and there is no God else besides Me; a just God and a Saviour there is none besides Me.Isaiah 45:21-22.
I, Jehovah, am thy God... and thou shalt acknowledge no God besides Me for there is no Saviour besides Me. Hosea 13:4.
Thus saith Jehovah the King of Israel, and His Redeemer, Jehovah Zebaoth: I am the First and I am the Last, and besides Me there is no God.Isaiah 44:6.
Jehovah Zebaoth is His Name, and thy Redeemer the Holy One of Israel; the God of the whole earth shall He be called.Isaiah 54:5.
In that day... Jehovah shall be King over all the earth; in that day there shall be one Jehovah and His Name One. Zechariah 14:9.
There are also many more such passages.