Skandapurana 16.106.41

16.106.41

yaśca sarvamidaṃ hanyādbrāhmaṇaṃ cāpi tatsamam ..
so'gniḥ so'rko mahātejā viṣaṃ bhavati kopitaḥ .. 41 ..

And he who would destroy all this [universe] is equal to one who kills a brahmin. / [A brahmin] is fire; he is the sun of great radiance; when angered, he becomes poison.