Ramayana
ईदृशो ह्यश्वमेधस्य प्रसादो रघुनन्दन । यजस्व सुमहाभाग हयमेधेन पार्थिव ॥ 7-86-20 ॥
Such, O delight of the Raghus, is the gracious power of the horse-sacrifice; therefore, O greatly fortunate king, perform the sacrifice of the horse.
english translation