God's mandate and the way to it

The book talks about closer to God Almighty with the obligatory prayers, and it enters into these duties of its kinds of belief and practical and left like sincerity of monotheism in all deeds, rejecting polytheism of all kinds and performing the prayers imposed in their times, zakat, fasting, pilgrimage, righteousness of parents, leaving adultery, drinking wine, lying, fraud, betrayal, and so on....