1. Brahmā Sutta. The Buddha is under the Ajapālanigrodha, soon after the Enlightenment, pondering on the four satipatthānas as the only way to Nibbanā. Sahampati visits him and agrees with his sentiments. S.v.167.
2. Brahmā Sutta. The scene is the same as in the above. The Buddha is reflecting on the five indriyas (saddhā, sati, etc.), as the way to Nibbāna, and Sahampati visits him and agrees with him, relating how, when he was a monk named Sahaka, in the time of Kassapa Buddha, he developed the five indriyas and was born in the Brahma world. S.v.232f.