Matsyapurana 69.6

69.6

vaivasvatākhye saṃjāte saptame saptalokakṛt
dvāparākhyaṃ yugaṃ tadvad aṣṭāviṃśatimaṃ jaguḥ //

Śiva said :--After this 23rd Rathantara Kalpa, will again follow Vârâha Kalpa. In that Kalpa, also, there will be 14 manvantaras. The seventh of these will be Vaivaswata manvantara. In the 28th Dvâpara yuga of the Vaivasvata manvantara will be born the great God, Vâsudeva-Janârdana. By the end of the same (28th Dwâpara) age, Lord Viṣṇu will manifest Himself in three different ways, to relieve the world of its burden.—5-7.