Yuga-Vibhāga and Kāla-Pramāṇa
Measures of Time and the Four Yugas
चक्रं रथो मणिः खड्गश्चर्मरत्नं च पञ्चमम् / केतुर्निधिश्च सप्तैव प्राणहीनानि चक्षते
cakraṃ ratho maṇiḥ khaḍgaścarmaratnaṃ ca pañcamam / keturnidhiśca saptaiva prāṇahīnāni cakṣate
The Wheel, the Chariot, the Jewel, the Sword, the Shield-ratna as the fifth, the Banner (Ketu), and the Treasure—these seven are said to be without life.