《汉书·志·郊祀志上》
于是类祭上天，里祭六宗，望祭山川，遍祭群神。
遂类于上帝，禋于六宗，望秩于山川，遍于群神。
Then he sacrificed collectively to heaven over a distance, isolatedly to the Six Deities, reverently to the mountains and rivers, and universally to the spirits and divinities. 