Ramayana
काले काले तु धर्मात्मा पुष्पकेण धनेश्वरः । अभ्यागच्छद्विनीतात्मा पितरं मातरं च हि ॥ 7-3-35 ॥
From time to time that righteous-souled lord of wealth, humble of spirit, would come by the Pushpaka chariot to visit his father and his mother.
english translation