Valmiki Ramayana Bala Kanda Sarga 37 Shloka 12
Original Shlokaदेवतानां प्रतिज्ञाय गङ्गामभ्येत्य पावक:। गर्भं धारय वै देवि देवतानामिदं प्रियम्।।1.37.12।।
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पावक: fire deity, देवतानाम् for devatas, प्रतिज्ञाय promised, गङ्गाम् Ganga, अभ्येत्य having approached, देवि O devi, गर्भम् pregnancy, धारय वै bear, इदम् this, देवतानाम् devatas', प्रियम् desire.
"The Firegod gave his consent. The devatas approached Ganga and said, 'O goddess bear the energy of Siva (inyour world) since this cause is dear to the gods'.