Shivapurana 5.19.6

Śivapurāṇa (complete text) 5.19.6

saptarṣimaṇḍalaṃ tasmāllakṣeṇaikena saṃsthitam |
ṛṣibhyastu sahasrāṇāṃ śatādūrdhvaṃ dhruvaḥ sthitaḥ ||