Dhammapada Verse 363
Kokalika Vatthu

Yo mukhasamyato bhikkhu
mantabhani anuddhato
attham dhammanca dipeti
madhuram tassa bhasitam.

Verse 363: The bhikkhu who controls his mouth (speech) who speaks wisely with his mind composed, who explains the meaning and the text of the Dhamma, — sweet are the words of that bhikkhu.

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The Story of Bhikkhu Kokalika

While residing at the Jetavana monastery, the Buddha uttered Verse (363) of this book, with reference to Bhikkhu Kokalika.

Bhikkhu Kokalika had abused the two Chief Disciples, the Venerable Sariputta and the Venerable Maha Moggallana. For this evil deed Kokalika was swallowed up by the earth and had to suffer in Paduma Niraya. Learning about his fate, the bhikkhus remarked that Kokalika had to suffer grievously because he did not control his tongue. To those bhikkhus, the Buddha said, "Bhikkhus! A bhikkhu must have control over his tongue; his conduct must be good; his mind must be calm, subdued and not flitting about as it pleases."

Then the Buddha spoke in verse as follows:

Verse 363: The bhikkhu who controls his mouth (speech) who speaks wisely with his mind composed, who explains the meaning and the text of the Dhamma, — sweet are the words of that bhikkhu.