Despite His being the Lord and being always willing to relieve the distress of sufferers, He [Kṛṣṇa] refrained from killing the Kurus, although they committed all sorts of sins and although He saw other kings constantly agitating the earth by their strong military movements carried out under the dictation of three kinds of false pride.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
नूनं नृपाणां त्रिमदोत्पथानां महीं मुहुश्चालयतां चमूभिः । वधात्प्रपन्नार्तिजिहीर्षयेशो- ऽप्युपैक्षताघं भगवान्कुरूणाम्
nūnaṃ nṛpāṇāṃ trimadotpathānāṃ mahīṃ muhuścālayatāṃ camūbhiḥ | vadhātprapannārtijihīrṣayeśo- 'pyupaikṣatāghaṃ bhagavānkurūṇām
SB 3.1.43