Shiva Purana
समाहितः पठेद्यस्तु तत्र श्रीरुद्र संहिताम् । स ब्रह्मघ्नोऽपि पूतात्मा त्रिभिरेवादिनैर्भवेत् ३४ ।
He who reads the Rudrasaṃhitā portion of Śiva-purāṇa with pure and concentrated mind becomes a purified soul within three days even though he might have killed a brahmin.
english translation
samAhitaH paThedyastu tatra zrIrudra saMhitAm । sa brahmaghno'pi pUtAtmA tribhirevAdinairbhavet 34 ।
hk transliteration by Sanscript