《魏书·列传·卷二十九》
愚以为征召百姓经营，必有 庶民子来 之歌；兴造之事加紧，将致 不日成之 之美。
愚谓召民经始，必有子来之歌；兴造勿亟，将致不日之美。
I believe that by recruiting the people to manage it, there will surely be the song of "the common people's sons are coming"; if the construction is stepped up, it will soon be completed.