सङ्करो नरकायैव कुलघ्नानां कुलस्य च।
पतन्ति पितरो ह्येषां लुप्तपिण्डोदकक्रियाः।।1.42।।
1.42. The intermixture leads the family-ruiners and the family to nothing but the hell; for, their ancestors (their individual souls) fall down [in hell], being deprived of the rites of offering rice-balls and water [intended to them].
1.35 1.44 Nihatya etc. upto anususruma. Sin alone is the agent in the act of slaying these desperadoes. Therefore here the idea is this : These ememies of ours have been slain, i.e., have been take possession of, by sin. Sin would come to us also after slaying them. Sin in this context is the disregard, on account of greed etc., to the injurious conseences like the ruination of the family and the like. That is why Arjuna makes a specific mention of the [ruin of the] family etc., and of its duties in the passage How by slaying my own kinsmen etc. The act of slaying, undertaken with an individualizing idea about its result, and with a particularizing idea about the person to be slain, is a great sin. To say this very thing precisely and to indicate the intensity of his own agony, Arjuna says only to himself [see next sloka]:
Sankaro narakaayaiva kulaghnaanaam kulasya cha; Patanti pitaro hyeshaam luptapindodakakriyaah.
saṅkaraḥ—unwanted children; narakāya—hellish; eva—indeed; kula-ghnānām—for those who destroy the family; kulasya—of the family; cha—also; patanti—fall; pitaraḥ—ancestors; hi—verily; eṣhām—their; lupta—deprived of; piṇḍodaka-kriyāḥ—performances of sacrificial offerings