Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 33
Sanskrit:
अदृष्ट्वा निर्गमं शौरे: प्रविष्टस्य बिलं जना: ।प्रतीक्ष्य द्वादशाहानि दु:खिता: स्वपुरं ययु: ॥ ३३ ॥
ITRANS:
adṛṣṭvā nirgamaṁ śaureḥpraviṣṭasya bilaṁ janāḥpratīkṣya dvādaśāhāniduḥkhitāḥ sva-puraṁ yayuḥ
Translation:
After Lord Śauri had entered the cave, the people of Dvārakā who had accompanied Him had waited twelve days without seeing Him come out again. Finally they had given up and returned to their city in great sorrow.