Apastambagrihyasutra 7.17.1

7.17.1

dakṣiṇāpratyakpravaṇamagarāvakāśamuddhatya palāśena śamīmayena vodūhenaitāmeva diśamuttarayodūhati \ 1 \

The ground for building a house should be inclined towards the south-west. He elevates the surface and sweeps (the earth) with a broom of Palâsa wood or of Sami wood, with the next (verse, M. II, 15, 1), in the same (south-west) direction;