Shiva Purana
श्रौतं भस्म तथा स्मार्तं द्विजानामेव कीर्तितम् । अन्येषामपि सर्वेषामपरं भस्म लौकिकम् ४ ।
The Śrauta and the Smārta ashes are to be used only by the twice-born. The Laukika can be used by every one.
english translation
zrautaM bhasma tathA smArtaM dvijAnAmeva kIrtitam । anyeSAmapi sarveSAmaparaM bhasma laukikam 4 ।
hk transliteration by Sanscript