Shiva Purana
अश्वमेधसहस्रस्य यत्फलं समुदाहृतम् ॥ तत्फलं समावाप्नोति देवाग्रे यो जपं चरेत् ॥ १७ ॥
He who performs Japas in front of the deity obtains that benefit which is mentioned as the fruit of a thousand horse-sacrifices.
english translation
azvamedhasahasrasya yatphalaM samudAhRtam ॥ tatphalaM samAvApnoti devAgre yo japaM caret ॥ 17 ॥
hk transliteration by Sanscript