Shiva Purana
करिष्य इति संकल्प्य मण्डलत्रयमर्च्य च ॥ आत्मानमन्तरात्मानं परमात्मनमप्यतः ॥ ३७ ॥
Having resolved to do so he worshiped the three mandalas The Self within the Self and the Supreme Self.
english translation
kariSya iti saMkalpya maNDalatrayamarcya ca ॥ AtmAnamantarAtmAnaM paramAtmanamapyataH ॥ 37 ॥
hk transliteration by Sanscript