Knowing the enemy's location, Krishna issues the tactical strike order. He says 'tasmāt' (therefore), O best of the Bharatas. In the very beginning (ādau), you must regulate and control the senses (indriyāṇy niyamya). By cutting off the entry point, you must forcefully strike down and slay (prajahi hy enaṃ) this great sinful enemy (pāpmānaṃ). Why? Because if left unchecked, it is the ultimate destroyer (nāśanam) of both theoretical knowledge (jñāna) and realized wisdom (vijñāna).