Shiva Purana
शिवनिन्दारतं हंतुमशक्तो यः स्वयं मृतः ॥ सद्य एव प्रमुच्येत त्रिः सप्तकुलसंयुतः ॥ ५४ ॥
He who dies after fighting being incapable of killing a disparager of Śiva shall be liberated with the members of his family for twenty-one generations.
english translation
zivanindArataM haMtumazakto yaH svayaM mRtaH ॥ sadya eva pramucyeta triH saptakulasaMyutaH ॥ 54 ॥
hk transliteration by Sanscript