Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 17

Sanskrit:

श्रीभगवानुवाचमिथो भजन्ति ये सख्य: स्वार्थैकान्तोद्यमा हि ते ।न तत्र सौहृदं धर्म: स्वार्थार्थं तद्धि नान्यथा ॥ १७ ॥

ITRANS:

śrī-bhagavān uvācamitho bhajanti ye sakhyaḥsvārthaikāntodyamā hi tena tatra sauhṛdaṁ dharmaḥsvārthārthaṁ tad dhi nānyathā

Translation:

The Supreme Personality of Godhead said: So-called friends who show affection for each other only to benefit themselves are actually selfish. They have no true friendship, nor are they following the true principles of religion. Indeed, if they did not expect benefit for themselves, they would not reciprocate.

Purport:

The Lord here reminds the gopīs that in pure loving friendship there is no sense of selfish interest but rather only love for one’s friend.