The earliest recorded story that mentions time travel is the Hindu Mahabharata (700 BCE) where King Revaita travels to Dwaraka and meets Brahma, the creator deity. When Revaita returns, he learns that 27 chaturyugas (648,000 years) have passed since his departure and that the race of men dwindled in stature, reduced in vigour, and enfeebled in intellect:

The son of this prince was Raivata or Kakudmín, the eldest of a hundred brethren. He had a very lovely daughter, and not finding any one worthy of her hand, he repaired with her to the region of Brahmá to consult the god where a fit bridegroom was to be met with. When he arrived, the quiristers Háhá, Húhú, and others, were singing before Brahmá; and Raivata, waiting till they had finished, imagined the ages that elapsed during their performance to be but as a moment. At the end of their singing, Raivata prostrated himself before Brahmá, and explained his errand.

"Whom should you wish for a son-in-law?" demanded Brahmá; and the king mentioned to him various persons with whom he could be well pleased.

Nodding his head gently, and graciously smiling, Brahmá said to him, "Of those whom you have named the third or fourth generation no longer survives, for many successions of ages have passed away whilst you were listening to our songsters: now upon earth the twenty-eighth great age of the present Manu is nearly finished, and the Kali period is at hand. You must therefore bestow this virgin gem upon some other husband, for you are now alone, and your friends, your ministers, servants, wife, kinsmen, armies, and treasures, have long since been swept away by the hand of time."

Overcome with astonishment and alarm, the Rája then said to Brahmá, "Since I am thus circumstanced, do thou, lord, tell me unto whom the maiden shall be given!"

And the creator of the world, whose throne is the lotus, thus benignantly replied to the prince, as he stood bowed and humble before him: "The being of whose commencement, course, and termination, we are ignorant; the unborn and omnipresent essence of all things; he whose real and infinite nature and essence we do not know--is the supreme Vishńu. He is time, made up of moments and hours and years; whose influence is the source of perpetual change. He is the universal form of all things, from birth to death, he is eternal, without name or shape. Through the favour of that imperishable being am I the agent of his power in creation: through his anger is Rudra the destroyer of the world: and the cause of preservation, Purusha, proceeds also from him. The unborn having assumed my person creates the world; in his own essence he provides for its duration; in the form of Rudra he devours all things; and with the body of Ananta he upholds them. Impersonated as Indra and the other gods he is the guardian of mankind; and as the sun and moon he disperses darkness. Taking upon himself the nature of fire he bestows warmth and maturity; and in the condition of the earth nourishes all beings. As one with air he gives activity to existence; and as one with water he satisfies all wants: whilst in the state of ether, associated with universal aggregation, he furnishes space for all objects. He is at once the creator, and that which is created; the preserver, and that which is preserved; the destroyer, and, as one with all things, that which is destroyed; and, as the indestructible, he is distinct from these three vicissitudes. In him is the world; he is the world; and he, the primeval self-born, is again present in the world. That mighty Vishńu, who is paramount over all beings, is now in a portion of himself upon the earth. That city Kuśasthalí which was formerly your capital, and rivalled the city of the immortals, is now known as Dwáraka, and there reigns a portion of that divine being in the person of Baladeva; to him, who appears as a man, present her as a wife: he is a worthy bridegroom for this excellent damsel, and she is a suitable bride for him."

Being thus instructed by the lotus-born divinity, Raivata returned with his daughter to earth, where he found the race of men dwindled in stature, reduced in vigour, and enfeebled in intellect. Repairing to the city of Kuśasthalí, which he found much altered, the wise monarch bestowed his unequalled daughter on the wielder of the ploughshare, whose breast was as fair and radiant as crystal. Beholding the damsel of excessively lofty height, the chief, whose banner is a palm-tree, shortened her with the end of his ploughshare, and she became his wife. Balaráma having espoused, agreeably to the ritual, Revatí, the daughter of Raivata, the king retired to the mountain Himálaya, and ended his days in devout austerities.

Vishnu-Purana (Book IV, chap I)