All writers of the Chaldaean period associate monotheism in the closest way with unity of worship.
Until the building of Solomons temple the unity of worship according to it had, properly speaking, never had any existence; and, moreover, it is easy to read between the lines that even after that date it was more a pious wish than a practical demand.
As we learn from the New Testament, the Jews and the Samaritans in the days of Jesus were not agreed on the question which was the proper place of worship, but that there could be only one was taken to be as certain as the unity of God Himself.
The Law is never weary of again and again repeating its injunction of local unity of worship.