Allah Taala said in the Quran:
[Shakir 16:51] And Allah has said: Take not two gods, He is only one Allah; so of Me alone should you be afraid.
And He also said:
[Shakir 39:69] And the earth shall beam with the light of its Lord, and the Book shall be laid down, and the prophets and the witnesses shall be brought up, and judgment shall be given between them with justice, and they shall not be dealt with unjustly.
Now let us check tafsir of these two verses, which shia ascribed to their Masoom Imam.
Shaykh of shias Mirza Muhammad Taqi in the book “Sahefatul Abrar” (1/244):
(Chain) from al-Mufaddal ibn Umar that he heard Abu Abdullah (alaihi salam) saying regarding words of Allah “the earth shall beam with the light of its Lord” – Lord of Earth mean Imam of Earth…
Abu Baseer: I heard Abu Abdullah (alaihi salam) said: “Take not two gods, He is only one Allah” – by this mean DON’T TAKE TWO IMAMS, HE IS THE ONE IMAM.
From Abu Abdullah (alaihi salam), which said about words of Allah “Is there a god with Allah? Nay! most of them do not know!” – Mean Imam of the Way with Imam of misguidance in the same time?
At the very same place, shia author talks about those who reject these kind of ahadeth, and ascribe them to ghuluw. He says:
And they are in the ignorance (ghaflat) regarding divine realities. Reports almost reach level of tawatur, that shirk in the wilayat of commander of faithful is shirk with Allah, and disbelief in him is disbelief in Allah, and who takes Imam along with him, takes God along with Allah.