Markandeyapurana 48.23

48.23

varṇena kapilenogrāste bhūtāḥ piśitāśanāḥ /
dhyāyato gāṃ tatastasya gandharvā jajñire sutāḥ //

When the creator Brahmā saw them, the hair of his head through his displeasure grew withered[8] and lost its erectibility.[9] Through its downward gliding[10] it became the Serpents,[11] and from its loss[12] of credibility they are known as the Ahis or Snakes. Thereupon in anger at having seen the Serpents, he fashioned beings possessed with anger;[13] they were born as the flesh-eating demons, tawny-hued and fierce.

Next while he meditated on the earth,[14] the Gandharvas were horn as his offspring. They were born from him as he drank speech in,[15] hence they are known as the Gandharvas.