Shiva Purana
तत्रैते बहवो लोका बृहज्जाबालचोदिताः । ते विचार्याः प्रयत्नेन ततो भस्मरतो भवेत् ४९ ।
There are many worlds to be attained as explained in Bṛhajjābāla Upaniṣad; taking that into consideration a man shall be devoted to the ashes (bhasma).
english translation
tatraite bahavo lokA bRhajjAbAlacoditAH । te vicAryAH prayatnena tato bhasmarato bhavet 49 ।
hk transliteration by Sanscript