坐禪三昧經 1.63

1.63

已得隨法當行止法。止法者，數隨心極，住意風門，念入出息。

"Having mastered the method of following, one should practice the method of stopping. As for the method of stopping: when the mind is fatigued by counting and following, one fixes attention on the aperture of the breath and is mindful of the inhalation and exhalation."