When Shakyamuni Buddha was at Mount Grdhrakuta, he held up a flower to his listeners. Everyone was silent. Only Mahakashyapa broke into a broad smile. The Buddha said, "I have the True Dharma Eye, the Marvelous Mind of Nirvana, the True Form of the Formless, and the Subtle Dharma Gate, independent of words and transmitted beyond doctrine. This I have entrusted to Mahakashyapa."
Source: The Mumonkan, Zen Koans, Case 6; Two Zen classics: Mumonkan and Hekiganroku - Page 41 by Huikai, Hui-kʿai, Katsuki Sekida, A. V. Grimstone, Xuedou, Yuanwu, Yüan-wu
Contributed by: Zaady