योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-67, verse-48

तादृक्षवेदनात्तेजःशब्दार्थोन्मुखतां गतः ।
भविष्यन्नेत्रनाम्नैकदेशे भवति भासनम् ॥ ४८ ॥

tādṛkṣavedanāttejaḥśabdārthonmukhatāṃ gataḥ ,
bhaviṣyannetranāmnaikadeśe bhavati bhāsanam 48

48. This god next found in his understanding the knowledge of the word taste, and got the notion of its becoming the object of a particular organ of sense, to be hereafter called “the tongue.”