These four noble truths are fundamental teaching.The heart of the Buddha's teaching lies in the Four Noble Truths (Cattari Ariyasaccani) which He taught in his first sermon to his old companions, the five ascetics, at Isipatana- Deer Park(modern Sarnath) near Benares. In this sermon, as we have it in the original texts, these four truths are given briefly. They are :
1. Dukkha sacca - the Truth of Suffering
2. Samudaya sacca - the Truth of the Cause of Suffering
3. Nirodha sacca - the Truth of the Cessation of Suffering
4.Magga sacca - the Truth of the Path leading to the Cessation of Suffering
But there are innumerable places in the early Buddhist scriptures where they are explained again and again, which greater detail and different ways.