Ramayana
शीघ्रं वै यज यज्ञं त्वं वैष्णवं सुसमाहितः । पावितस्तेन यज्ञेन यास्यसे त्रिदिवं ततः ॥ 7-30-48 ॥
Swiftly indeed perform the Vaishnava sacrifice, well-concentrated; purified by that sacrifice, you shall thereafter go to heaven.
english translation