Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 1.35

1.35

caturviṃśatisaṃkhyātaṃ sahasrāṇi tu śaunaka /
caturbhiḥ parvabhiḥ proktaṃ bhaviṣyaṃ pañcamaṃ tathā //

It is counted as twenty-four thousand [verses], O Śaunaka.
The Bhaviṣya is taught as fifth, with four sections;