Brihat Samhita
स्वातावषाढास्वथ रोहिणीषु पापग्रहा योगगता न शस्ताः । ग्राह्यं तु योगद्वयं अप्युपोष्य यदाधिमासो द्विगुणीकरोति ॥ २६-११ ॥
In the Svāti, Āṣādhī and Rohiṇī Yogas, if the Moon should be accompanied by malefic planets, there will be misery in the land. If on account of the intervention of the intercalary lunar month, the Yoga day should occur twice, the observation shall be made on both the days and the effect, whether good or bad, will be doubled.
english translation
svAtAvaSADhAsvatha rohiNISu pApagrahA yogagatA na zastAH । grAhyaM tu yogadvayaM apyupoSya yadAdhimAso dviguNIkaroti ॥ 26-11 ॥
hk transliteration by Sanscript