Final answer:
The book refers to the Quran, which is guidance for 'people of taqwah'. It specifies two groups: the believers (al-Mu'minun) and Muslims, those who adhere to the faith and the teachings of Islam.
Step-by-step explanation:
When Allah said that the book is guidance for the people of taqwah, He referred to two groups which are mentioned in the Quran. The two groups are the believers (al-Mu'minun) and Muslims (those who have submitted to God). These terms also align with the broader Islamic concept of the Ummah, or community of believers, which encompasses those who have bound themselves in faith to Allah and the teachings of the Prophet Muhammad.
In Islam, taqwah generally refers to a state of consciousness where one consistently remains aware of Allah's presence and strives to abide by His guidance, leading a devout and righteous life. It is often translated to mean 'piety' or 'godliness'. Hence, the Quran, being the holy scripture of Islam, is seen as a guide for those who have taqwah, guiding them in their spiritual and worldly affairs.