Aṅguttara Nikāya 7.18
Translators: sujato
Numbered Discourses 7.18
2. Anusayavagga
2. Tendencies
Anattānupassīsutta
Observing Not-self
Sabbesu dhammesu anattānupassī viharati …pe….
“First, take a person who meditates observing not-self in all things. They perceive not-self and experience not-self. Constantly, continually, and without interruption, they apply the mind and fathom with wisdom. …”
Aṭṭhamaṁ.