Vaishnava Samhita. Ganga Yamuna Charitam. Vol II Book VI Chp 4 Shlokas 18- 19

दुर्बुद्धिः सोपि विप्रोपि कन्याविक्रायनिश्चयः
प्रतस्थे म्लेच्छराजेन्द्रसन्निधिं धनलोलुपः ||
ब्रह्मबन्धोर्मनोभावं विज्ञाय च भयाकुले 
सद्य एव प्रतस्थाते कन्यके यमुनावनम्    ||

The scheming brahmana planned to sell those girls for money and hence he took them to the court of the mleccha king. The girls became frightened when they learnt the evil designs of the brahmana and hence they left for Shri Brindavan