Skandapurana 1.4.59.132

1.4.59.132

oṃ gāṃ gaṇapataye svāheti mantreṇa guggulaguṭikābhirhomaṃ vidadhyādviniyogaṃ ceti gāṇeśvaro tā?kalpaḥ ..

and with the mantra, “Oṃ gāṃ, to Gaṇapati, svāhā,” he should perform the fire sacrifice with pellets of bdellium and recite the ritual application. Such is the ritual procedure of Gaṇeśa.