長阿含經 4.p46

4.p46

“‘“After observing the body internally, the knowledge of other bodies arises. After observing feelings internally, the knowledge of other feelings arises. After observing the mind internally, knowledge of other minds arises. After observing the teachings internally, the knowledge of other teachings arises. This is how the Tathāgata skillfully discerns and teaches the four abodes of mindfulness.