The Long Āgama Sūtra 25.27

25.27

佛告迦葉：「諸世間諸所有戒，無有與此增上戒等者，況欲出其上？諸有三昧、智慧、解脫、見解脫慧，無有與此增上三昧、智慧、解脫、見解脫慧等者，況欲出其上？迦葉！所謂師子者，是如來、至真、等正覺，如來於大眾中廣說法時，自在無畏，故號師子。云何，迦葉！汝謂如來師子吼時不勇捍耶？勿造斯觀，如來師子吼勇捍無畏。迦葉！汝謂如來勇捍師子吼時不在大眾中耶？勿造斯觀，如來在大眾中勇捍師子吼。迦葉！汝謂如來在大眾中作師子吼不能說法耶？勿造斯觀。所以者何？如來在大眾中勇捍無畏，作師子吼，善能說法。

The Buddha told Kāśyapa, “Those precepts possessed by the world don’t possess or accompany the higher precepts, and the rest. How could they want to produce anything higher? They possess samādhi, wisdom, and liberation, and have seen the liberation of wisdom, but they don’t possess or accompany these higher samādhi, wisdom, liberation, and seeing the liberation of wisdom. How could they want to produce anything higher?

“Kāśyapa, the Tathāgata, Arhat, and Completely Awakened One is a lion. When he teachings Dharma in detail in a great assembly, he’s sovereign and fearless, so he’s called a lion.

“How is it, Kāśyapa? Would you say that Tathāgata isn’t courageous when he roars the lion’s roar? Don’t imagine this. The Tathāgata’s lion’s roar is courageous and fearless.

“Kāśyapa, would you say the Tathāgata’s courageous and fearless lion’s roar isn’t done in a large assembly? Don’t imagine this. The Tathāgata courageously roars the lion’s roar in a large assembly.

“Kāśyapa, would you say that the Tathāgata doesn’t teach the Dharma when he courageously roars the lion’s roar in a large assembly? Don’t imagine this. Why is that? The Tathāgata skillfully teaches the Dharma when he courageously and fearlessly roars the lion’s roar in a large assembly.