Devibhagavatapurana 2.3.40

2.3.40

tasmāddyaurmānuṣe dehe dīrghakālaṃ vasiṣyati |
te śaptāḥ pathi gacchantīṃ gaṅgāṃ dṛṣṭvā saridvarām ||

While the Vasus, thus cursed, were returning, they saw on the way the chief river Gangâ Devî also cursed and therefore distressed; all of them bowed down to her simultaneously and said: “O Devî! A serious thought is troubling our minds, how can we, who live on nectar, take our birth in human wombs; so, O best river! You better be a woman and give birth to us. O Sinless one! You better be the wife of the sage King S’antanu and no sooner we be born of your womb, kindly throw us in the river Gangâ (your water). If you do thus, O Gangâ we will certainly be freed of our curse.” Gangâ Devî replied “Well; that will be.” Thus spoken, the Vasus went to their respective places; and Gangâ Devî, too, thinking on the subject again and again, went out of that place. At this time Mahâbhisa became born as a son of the king Pratîpa and became known as S’antanu. He was exceedingly religious and true to his promise. One day while the King Pratîpa was praising the Sûrya Devî (the sun) of unequalled energy, Gangâ Devî assumed an extraordinarily beautiful feminine form and came out of the waters and sat on the right thigh, resembling like a sâl tree, of the king Pratîpa. The sage king Pratîp spoke out to the lady sitting on his right thigh, thus:-- “O beautiful faced one! Why, unasked, have you sat on my auspicious right thigh?” The lovely Gangâ then replied:-- “Hear why I have sat here. O best of Kurus! O king! Becoming attached to you, I have sat on your thigh; so please accept me.” At this the king Pratîpa spoke to the beautiful lady, full of youth and beauty, “I never go, simply out of passion to another's wife. There is another point; you have sat on my right thigh; that is the seat of sons and son's wives; so, when my desired son will be born, you will then, be my son's wife. And certainly, by your good will, my son will be born.” The lady, of divine form, said, Well; that will be done! and went away. The king returned to his palace, thinking of the lady. After some time, he had a son born to him and when the son attained his teens, the king desired to lead a forest life and communicated this matter to his son. He said also, if the aforesaid beautifully smiling girl comes to you to marry, then marry her. And I am also ordering you not to question her anything “who are you” and so forth. If you take her as your legal wife, you will certainly be happy. Thus saying to his son, the king Pratîpa handed over all his kingdom to his son and gladly retired into the forest. The king practised tapasyâ in the forest and worshipped Ambikâ; on quitting his mortal coil, he went by his sheer merit to the Heavens. The highly energetic king S’antanu, on getting his kingdom, began to administer justice according to the laws of Dharma and governed his subjects.
Thus ends the third Chapter of the Second Skandha on the description of the curse on Gangâ, Mahâbhisa and Vasus in the Mâhapurânam S’rî Mad Devî Bhâgavatam of 18,000 verses.