Devibhagavatapurana 5.2.27

5.2.27

vyāsa uvāca |
tacchutvā vacanaṃ rambhaḥ pāvakasya subhāṣitam |
tato'bravīdvaco rambhastyaktvā keśakalāpakam ||

Vyâsa said:-- O king! Hearing thus the sweet words of Fire, Rambha quitted the hold of his hairs and said:-- O Lord of the Devas! If thou art pleased, grant my desired boon that a son be born unto me, who will destroy the forces of my enemy and who will conquer the three worlds. And that son be invincible in every way by the Devas, Dânavas and men, very powerful, assuming forms at will, and respected by all. The Fire said:-- O highly Fortunate! You will get your son, as you desire; therefore desist now from your attempting suicide. O highly fortunate Rambha! With any female of whichever species, you will co-habit, you will get a son, more powerful than you; there is no doubt in this.