Brihat Parashara Hora Shastra
राहुणा तामसीं दुर्गां सेवते क्षुद्रदेवताम् । भक्तिः स्कन्देऽथ हेरभ्भे शिखिना केवलेन वा ॥ ७२॥
Rahu will make one worship Durga, or some mean deity. Ketu alone denotes Subramanya‟s, or Ganesh‟s worshipper.
english translation
rAhuNA tAmasIM durgAM sevate kSudradevatAm । bhaktiH skande'tha herabhbhe zikhinA kevalena vA ॥ 72॥
hk transliteration by Sanscript