Brihat Parashara Hora Shastra
लाभेशस्य दशाकाले लाभे बाधा रुजोभयम् । व्ययेशस्य दशा नृणां बहुकष्टप्रदा द्विज ॥ ७॥
A Grah, placed in an auspicious Bhava, like Trikon etc., at the commencement of the Dasha, produces favourable results in his Dasha. The Grah, placed in Ari, Randhr, or Vyaya at that time, yields only adverse results during his Dasha.
english translation
lAbhezasya dazAkAle lAbhe bAdhA rujobhayam । vyayezasya dazA nRNAM bahukaSTapradA dvija ॥ 7॥
hk transliteration by Sanscript