Shiva Purana
पापशांतिर्विशेषेण ह्यादिवारे निवेदयेत् । आदित्यस्यैव देवानां ब्राह्मणानां विशिष्टदम् २८ ।
. The first day of the week dedicated to the sun has the special merit of the removal of sin, especially for brahmins.
english translation
pApazAMtirvizeSeNa hyAdivAre nivedayet । Adityasyaiva devAnAM brAhmaNAnAM viziSTadam 28 ।
hk transliteration by Sanscript