Skandapurana 5.213.26

5.213.26

pārthivo'yamiti jñātvā hyarghyādyairbhojanaiḥ sa ca ..
so'pi dṛṣṭvā prabhāvaṃ taṃ sarvaṃ dhenośca saṃbhavam ..
prārthayāmāsa tāṃ mūlyairgajavājisamu dbhavaiḥ .. 26 ..

Knowing, "This is a king," he [honored him] with guest-water and meals; / and he too, seeing that power and that all of it arose from the cow, / begged for her in exchange for prices consisting of elephants and horses. (26)