Brihat Parashara Hora Shastra
कृष्णे च बलिनः क्रूराः सौम्या वीर्ययुताः सिते। सौम्यायने सौम्यखेटो बली याम्यायनेऽपरः॥ ३७॥
During the dark half malefics are strong. Benefics acquire strength in the bright half of the month. Malefics and benefics are, respectively, strong in Dakshinayan and Uttarayan.
english translation
kRSNe ca balinaH krUrAH saumyA vIryayutAH site। saumyAyane saumyakheTo balI yAmyAyane'paraH॥ 37॥
hk transliteration by Sanscript