The Mahabharata/Book 1: Adi Parva…
“ And seeing the bow and arrows and deer-skin on the ground, he thought they might be the offspring of some Brahmana proficient in the science of arms. Deciding thus, he took up the children along with the bow and arrows, and showed what he had to the king. Beholding them the king was moved with pity, and saying, 'Let these become my children,' brought them to his palace. Then that first of men, Santanu, the son of Pratipa having brought Gautama's twins into his house, performed in respect of them the usual rites of religion. ”
