Ramayana
तं च रक्षन्ति गन्धर्वाः सायुधा युद्धकोविदाः । शैलूषस्य सुता वीर त्रिकोट्यो वै महाबलाः ॥ 7-100-11 ॥
And it is guarded, O hero, by Gandharvas skilled in battle and bearing arms — the sons of Shailusha, thirty million in number and of mighty strength.
english translation