Mahabharata 12.149.92

भीमः सुघोरश्च तथा नीलमेघसमप्रभःअस्मिञ्शवं परित्यज्य प्रेतकार्याण्युपासत

bhīmaḥ sughoraśca tathā nīlameghasamaprabhaḥasmiñśavaṃ parityajya pretakāryāṇyupāsata

Our plain-language meaning of this verse is waiting for scholar review.