佛說觀佛三昧海經 1.40

1.40

「未來世中諸弟子等應修三法。何等為三？一者、誦修多羅甚深經典。二者、淨持禁戒威儀無犯。三者、繫念思惟心不散亂。

"In future ages, the disciples should cultivate three dharmas. What are the three? First, reciting the profound sūtra scriptures. Second, purely maintaining the prohibitive precepts without violating the deportments. Third, binding thoughts in contemplation with an undistracted mind."