Shiva Purana
भस्मादाय तदाधारादघोस्त्राभिमन्त्रितम् ॥ विसृज्य शक्रमुद्दिश्य ननाद स मुनिस्तदा ॥ ४० ॥
He took some ashes from the receptacle and invoked it with the mantra Aghorāstra. The sage, thereafter discharged it against Indra and roared.
english translation
bhasmAdAya tadAdhArAdaghostrAbhimantritam ॥ visRjya zakramuddizya nanAda sa munistadA ॥ 40 ॥
hk transliteration by Sanscript