Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 27-28
Sanskrit:
सप्तर्षीणां तु यौ पूर्वौ दृश्येते उदितौ दिवि ।तयोस्तु मध्ये नक्षत्रं दृश्यते यत् समं निशि ॥ २७ ॥तेनैव ऋषयो युक्तास्तिष्ठन्त्यब्दशतं नृणाम् ।ते त्वदीये द्विजा: काल अधुना चाश्रिता मघा: ॥ २८ ॥
ITRANS:
saptarṣīṇāṁ tu yau pūrvaudṛśyete uditau divitayos tu madhye nakṣatraṁdṛśyate yat samaṁ niśi
Translation:
Of the seven stars forming the constellation of the seven sages, Pulaha and Kratu are the first to rise in the night sky. If a line running north and south were drawn through their midpoint, whichever of the lunar mansions this line passes through is said to be the ruling asterism of the constellation for that time. The Seven Sages will remain connected with that particular lunar mansion for one hundred human years. Currently, during your lifetime, they are situated in the nakṣatra called Maghā.