The "Linked Discourses on the Establishments of Mindfulness" contains discourses focusing on the four foundations of mindfulness: clear comprehension and full awareness of the body, felt experience, mind, and mental qualities. These teachings explore how to establish mindfulness as a means to develop right collectedness, insight and wisdom.
Satipaṭṭhānasaṁyutta - Linked Discourses on the Establishments of Mindfulness
Sāriputta boldly declares that no ascetic or brahmin has ever been, nor will ever be, more knowledgeable in direct knowing than the Blessed One in full awakening. He acknowledges that he cannot encompass the minds of all the Buddhas, past, future, or present. However, he understands a principle through the Dhamma - all those who become fully awakened do so by abandoning the five hindrances, establishing their minds in the four foundations of mindfulness, and developing the seven factors of awakening.
On the passing away of Sāriputta, the Buddha advises Ānanda to be an island unto himself, with no other refuge, with the Dhamma as his island, with the Dhamma as his refuge, not dependent on another as a refuge.
The Buddha explains how a bhikkhu should live with mindfulness and full awareness.