CC Antya 18.40

“aniṣṭa-śaṅkīni bandhu-hṛdayāni bhavanti hi”
Synonyms: 
aniṣṭa — of some mishap; śaṅkīni — possessing doubts; bandhu — of friends or relatives; hṛdayāni — hearts; bhavanti — become; hi — certainly.
Translation: 
“A relative or intimate friend is always fearful of some injury to his beloved.”
Purport: 

This is a quotation from the Abhijñāna-śakuntalā-nāṭaka.