Devibhagavatapurana 1.2.11

1.2.11

purāṇamuttamaṃ puṇyaṃ śrīmadbhāgavatābhidham |
aṣṭādaśa sahasrāṇi ślokāstatra tu saṃskṛtāḥ ||

The Purâna S’rimad Bhâgavat (Devî Bhâgavat) is excellent and holy; eighteen thousand pure S’lokas are contained in it. Bhagavân Krisna Dvaipâyan has divided this Purâna into twelve auspicious Skandhas (Books) and three hundred and eighteen chapters. Twenty chapters compose the first Skandha; twelve chapters in the second Skandha; thirty chapters in the the third Skandha; twenty-five chapters in the fourth Skandha, thirty-five, in the fifth; thirty-one, in the sixth; forty, in the seventh; twenty-four, in the eighth; fifty chapters in the ninth; thirteen, iu the tenth; twenty-four in the eleventh and fourteen chapters are contained in the twelfth Skandha, O Munis! Thus the Dvaipâyan Muni has arranged his chapters in each Skandha.