長阿含經 4.p45

4.p45

“‘Brahmā Kumāra then told the Trāyastriṃśa gods, “All of you, listen closely, and consider it well! I will speak further for you. The Tathāgata, the Arhat, skillfully discerns and teaches the four abodes of mindfulness. What are the four? 1. Observe the body internally with diligence and not lazily, with focused attention that’s not lost, and by removing worldly greed and sorrow. Observe the body externally with diligence and not lazily, with focused attention that’s not lost, and by removing worldly greed and sorrow. [2-4.] Observe feelings, mind, and teachings in the same way with diligence and not lazily, with focused attention that’s not lost, and by removing worldly greed and sorrow.