Shiva Purana
विधेः कपालं नामुंचत्करमत्यन्तदुस्सहम् ॥ परस्य भ्रमतः क्वापि तत्काश्यां क्षणतोऽपतत् ॥ ५८ ॥
The unbearable skull of Brahmā did not leave his hand as he was roaming elsewhere but it fell down in a trice at Kāśī.
english translation
vidheH kapAlaM nAmuMcatkaramatyantadussaham ॥ parasya bhramataH kvApi tatkAzyAM kSaNato'patat ॥ 58 ॥
hk transliteration by Sanscript