In Kali-yuga men will develop hatred for each other even over a few coins. Giving up all friendly relations, they will be ready to lose their own lives and kill even their own relatives.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
कलौ काकिणिकेऽप्यर्थे विगृह्य त्यक्तसौहृदाः । त्यक्ष्यन्ति च प्रियान् प्राणान् हनिष्यन्ति स्वकानपि
kalau kākiṇike'pyarthe vigṛhya tyaktasauhṛdāḥ | tyakṣyanti ca priyān prāṇān haniṣyanti svakānapi
SB 12.3.41