तस्मान्नार्हा वयं हन्तुं धार्तराष्ट्रान्स्वबान्धवान्।
स्वजनं हि कथं हत्वा सुखिनः स्याम माधव।।1.37।।
1.37. How could we be happy indeed, O Madhava, after slaying our own kinsmen ?
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]:
Tasmaan naarhaa vayam hantum dhaartaraashtraan swabaandhavaan; Swajanam hi katham hatwaa sukhinah syaama maadhava.
nihatya—by killing; dhārtarāṣhṭrān—the sons of Dhritarashtra; naḥ—our; kā—what; prītiḥ—pleasure; syāt—will there be; janārdana—he who looks after the public, Shree Krishna; pāpam—vices; eva—certainly; āśhrayet—must come upon; asmān—us; hatvā—by killing; etān—all these; ātatāyinaḥ—aggressors; tasmāt—hence; na—never; arhāḥ—behoove; vayam—we; hantum—to kill; dhārtarāṣhṭrān—the sons of Dhritarashtra; sva-bāndhavān—along with friends; sva-janam—kinsmen; hi—certainly; katham—how; hatvā—by killing; sukhinaḥ—happy; syāma—will we become; mādhava—Shree Krishna, the husband of Yogmaya