The Guide for the Perplexed
The principles can be seen listed in the Siddur Edot HaMizrach, Additions for Shacharit The omission of these principles listed within his later works, the Mishneh Torah and The Guide for the Perplexed, is controversial; though more for the Orthodox sect than many other sects including Reform and Conservative Judaism. This famous omission leads some to suggest that either he retracted his earlier position, or that these principles are descriptive rather than prescriptive.