Bhagavad Gita Chapter 1 Sloka 45 (1.45)

ಅಹೋ ಬತ ಮಹತ್ ಪಾಪಂ ಕರ್ತುಂ ವ್ಯವಸಿತಾ ವಯಮ್ ।
ಯದ್ ರಾಜ್ಯಸುಖಲೋಭೇನ ಹಂತುಂ ಸ್ವಜನಮುದ್ಯತಾಃ ॥೪೫॥
aho bata mahat pāpaṃ kartuṃ vyavasitā vayam |
yad rājyasukhalobhena haṃtuṃ svajanamudyatāḥ ||45||
Sloka 1:45
Gist of the sloka:
Oh, what a major mistake we were about to commit. In the desire to obtain rulership and comforts, we were greedy enough to kill our own relatives.
Explanation:
Arjuna almost on the verge of collapsing says, what a major sin/action we were about to commit. By proceeding in this manner, we would not only have killed our own relations but would also be cause of destruction of the society as it is now.