Valmiki Ramayana Bala Kanda Sarga 17 Shloka 18
Original Shlokaयस्य देवस्य यद्रूपं वेषो यश्च पराक्रम:। अजायत समस्तेन तस्य तस्य सुत: पृथक्।।1.17.18।।
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यस्य देवस्य for whichever god, यत् रूपम् whatever form, वेष: form of dress, पराक्रम:च prowess also, य: तस्य तस्य for that respective God, सुत: sons, पृथक् separately, तेनसमः similar to his procreator, अजायत was born.
The sons of devatas retained characteristics like beauty, form and prowess of their procreator (gods).