Anguttara Nikāya - The Numerical Discourses
1: The Book of the Ones
1. Obsession of the Mind - 296
1 "Ekadhammo, bhikkhave, bhāvito bahulīkato ekantanibbidāya virāgāya nirodhāya upasamāya abhiññāya sambodhāya nibbānāya saṃvattati. Katamo ekadhammo? Buddhānussati. Ayaṃ kho, bhikkhave, ekadhammo bhāvito bahulīkato ekantanibbidāya virāgāya nirodhāya upasamāya abhiññāya sambodhāya nibbānāya saṃvattatī"ti.