Shiva Purana
भस्मसंग्रहणं कुर्याद्देवे ऽनुद्वासिते सति ॥ उद्वासने कृते यस्माच्चण्डभस्म प्रजापते ॥ ६१ ॥
The ashes shall be collected before the ritualistic dismissal of the lord. After the rite of the ritualistic dismissal it becomes Caṇḍabhasma.
english translation
bhasmasaMgrahaNaM kuryAddeve 'nudvAsite sati ॥ udvAsane kRte yasmAccaNDabhasma prajApate ॥ 61 ॥
hk transliteration by Sanscript