He knew her and caused her to conceive. Indeed, in the womb of Ganga the seed of Agni began to grow even as Agni himself grows.
तया चाप्यभवन्मिश्रो गर्भे चास्यादधे तदा। ववृधे स तदा गर्भः कक्षे कृष्णगतिर्यथा।॥