增壹阿含經 17.1.p10

17.1.p10

The Bhagavān told him, “Rāhula, suppose there is a bhikṣu who is happy being alone in quietude. In a secluded place, he corrects his body, corrects his intention, and sits cross-legged. Without any other thoughts, he fastens his mind on the tip of his nose. [1] When there is a long breath out, he is also aware of the long breath. [2] When there is a long breath in, he is also aware of the long breath. [3] When there is a short breath out, he is also aware of the short breath. [4] When there is a short breath in, he is also aware of the short breath. [5] When there is a cold breath out, he is also aware of the cold breath. [6] When there is a cold breath in, he is also aware of the cold breath. [7] When there is a warm breath out, he is also aware of the warm breath. [8] When there is a warm breath in, he is also aware of the warm breath. [9] He completely contemplates the in-breaths and out-breaths of the body, aware of them all. [10] When there is breathing, he also is aware of its presence. [11] When there is no breathing, he is also aware of its absence. [12] If there is an out-breath conditioned by the mind, he is aware that the out-breath was conditioned by the mind. [13] If there is an in-breath conditioned by the mind, he is aware that the in-breath was conditioned by the mind. Thusly, Rāhula, one is able to cultivate the practice of Ānāpānasmṛti, to eliminate every notion of worry and sorrow, obtain the great fruit, and taste the sweet nectar of immortality.”