Shiva Purana
स्थिरास्थिरे ततः शुद्ध्यै शीतोष्णे च ततः पदे ॥ ध्यायेद्व्याप्त्यैकताकारे भूतशोधनकर्मणि ॥ ४७ ॥
Then, for conducting purity he shall meditate on the regions stable or unstable, hot or cold in the purificatory rite of the Bhūtas in the form of. unity that is pervaded.
english translation
sthirAsthire tataH zuddhyai zItoSNe ca tataH pade ॥ dhyAyedvyAptyaikatAkAre bhUtazodhanakarmaNi ॥ 47 ॥
hk transliteration by Sanscript