Majjhima Nikaya 5:145
SUJATOyampi taṁ diṭṭhaṁ sutaṁ mutaṁ viññātaṁ pattaṁ pariyesitaṁ, anuvicaritaṁ manasā tampi ‘etaṁ mama, esohamasmi, eso me attā’ti samanupassati;
whatever is seen, heard, thought, known, attained, sought, and explored by the mind as: ‘This is mine, I am this, this is my self.’