仁王護國般若波羅蜜多經 2.38

2.38

「善男子！十方法界一切如來，皆依此門而得成佛；若言越此得成佛者，是魔所說，非是佛說。是故汝等應如是知，如是見，如是信解。」

"Good sons! All Tathāgatas of the Dharma realms of the ten directions have attained Buddhahood relying on this gate. If someone says that one can attain Buddhahood bypassing this, that is taught by Māra, not taught by the Buddha. Therefore, you all should know it thus, see it thus, and faithfully understand it thus."