source of quotation

[Panorama of Russia]

Does any body know the source of this excerpt by 
drevnii pevets qouted in the Zhitie of Aleksandr 
Nevskii by Khitrov (Moscow, 1893)?


This exerpt is about about Vsevolod Bol'shoye Gnezdo:

"Ty mozhesh' moguchuiu Volgu razbryzgat' våslami 
liudei è vycherpat' Don mnogovodny shelomami rati tvoei"

«Òû ìîæåøü ìîãó÷óþ Âîëãó ràçáðûçãàòü âeñëàìè 
ëþäåé è âû÷åðïàòü Äîí ìíîãîâîäíûé øåëîìàìè ðàòè òâîåé»

Ñëîâî î ïîëêó Èãîðåâà has been suggested. If that is correct, where is it?

Thanks in advance,
Michael Braun

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