Skandapurana 6.3.220.37

6.3.220.37

śrāddhaṃ ca kāryaṃ vidhivatpitṛbhyo nṛpasattama .
evaṃ kṛte nṛpaśreṣṭha sarvapāpakṣayo bhavet .. 220.37 ..

And a śrāddha should be performed according to rule for the ancestors, O best of kings; / when this is done, O best of monarchs, the destruction of all sins occurs.