Ramayana
देवनिष्ठानभूतं तद्विमानं पुष्पकं मृधे । भज्यमानं तथैवासीदक्षयं ब्रह्मतेजसा ॥ 7-21-28 ॥
Yet that aerial car Pushpaka, the abode of the gods, though it was being broken apart in the battle, remained even so unchanged and indestructible, for it was imperishable by the power of Brahma's might.
english translation