Bhagavadgita 1.29-46

Arjuna said:
Seeing, O Krishna, these my kinsmen gathered here, eager for fight, my limbs fail me, and my mouth is parched up. I shiver all over, and my hair stands on end. The bow Gândiva slips from my hand, and my skin burns.

Neither, O Keshava, can I stand upright. My mind is in a whirl. And I see adverse omens.

Neither, O Krishna, do I see any good in killing these my own people in battle. I desire neither victory nor empire, nor yet pleasure.

Of what avail is dominion to us, of what avail are pleasures and even life, if these, O Govinda! for whose sake it is desired that empire, enjoyment and pleasure should be ours, themselves stand here in battle, having renounced life and wealth—Teachers, uncles, sons and also grandfathers, maternal uncles, fathers-in-law, grandsons, brothers-in-law, besides other kinsmen.

those for whose sake we desire kingdom, pleasures, and joys—
they are standing here in battle, having surrendered their lives and riches:

teachers, fathers, sons, and likewise grandfathers,
maternal uncles, fathers-in-law, grandsons, brothers-in-law, and other kinsmen.

Even though these were to kill me, O slayer of Madhu, I could not wish to kill them, not even for the sake of dominion over the three worlds, how much less for the sake of the earth!

What pleasure indeed could be ours, O Jnanârdana, from killing these sons of Dhritarâshtra? Sin only could take hold of us by the slaying of these felons.

Therefore ought we not to kill our kindred, the sons of Dhritarâshtra. For how could we, O Mâdhava, gain happiness by the slaying of our own kinsmen?

Though these, with understanding overpowered by greed, see no evil due to decay of families, and no sin in hostility to friends, why should we, O Janârdana, who see clearly the evil due to the decay of families, not turn away from this sin?

How should we not know enough to turn away from this evil,
seeing the fault caused by the destruction of the family, Janārdana?”

On the decay of a family the immemorial religious rites of that family die out. On the destruction of spirituality, impiety further overwhelms the whole of the family.

On the prevalence of impiety, O Krishna, the women of the family become corrupt; and women being corrupted, there arises, O Vârshneya, intermingling of castes.

Admixture of castes, indeed, is for the hell of the family and the destroyers of the family; their ancestors fall, deprived of the offerings of rice-ball and water.

By these misdeeds of the destroyers of the family, bringing about confusion of castes, are the immemorial religious rites of the caste and the family destroyed.

We have heard, O Janârdana, that inevitable is the dwelling in hell of those men in whose families religious practices have been destroyed.

Alas, we are involved in a great sin, in that we are prepared to slay our kinsmen, from greed of the pleasures of a kingdom!

Verily, if the sons of Dhritarâshtra, weapons in hand, were to slay me, unresisting and unarmed, in the battle, that would be better for me.