Skandapurana 5.31.55

5.31.55

phalaṃ śrāddhasya cātra tvaṃ kāraṇaṃ śṛṇu putraka ..
śrāddhārhā brāhmaṇāścātra camatkārapurodbhavāḥ .. 55 ..

nor was any fruit of the śrāddha; and hear the reason for this, dear son: / the brahmins born in Camatkārapura are alone worthy of a śrāddha here.