Manusmriti

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त्रिभ्य एव तु वेदेभ्यः पादं पादमदूदुहत् । तदित्यर्चोऽस्याः सावित्र्याः परमेष्ठी प्रजापतिः ॥ ७७ ॥

sanskrit

Moreover from the three Vedas Pragapati, who dwells in the highest heaven (Parameshthin), milked out (as it were) that Rik-verse, sacred to Savitri (Savitri), which begins with the word tad, one foot from each.

english translation

tribhya eva tu vedebhyaH pAdaM pAdamadUduhat | tadityarco'syAH sAvitryAH parameSThI prajApatiH || 77 ||

hk transliteration by Sanscript