Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 5
Sanskrit:
एवं मासं व्रतं चेरु: कुमार्य: कृष्णचेतस: ।भद्रकालीं समानर्चुर्भूयान्नन्दसुत: पति: ॥ ५ ॥
ITRANS:
evaṁ māsaṁ vrataṁ ceruḥkumāryaḥ kṛṣṇa-cetasaḥbhadrakālīṁ samānarcurbhūyān nanda-sutaḥ patiḥ
Translation:
Thus for an entire month the girls carried out their vow and properly worshiped the goddess Bhadrakālī, fully absorbing their minds in Kṛṣṇa and meditating upon the following thought: “May the son of King Nanda become my husband.”