Mahabharata 12.99.46

12.99.46

etattapaśca puṇyaṃ ca dharmaścaiva sanātanaḥ |
catvāraścāśramāstasya yo yuddhe na palāyate || 46 ||

That Kshatriya who duly observes his duty in battle, acquires by that act the merit of penances and of righteousness. Indeed, such conduct on his part conforms with the eternal path of duty. Such a man obtains the merits of all the four modes of life. The aged and the children should not be slain; nor one that is a woman; not one that is flying, away; nor one that holds a straw in his lips; nor one that says. 'I am thine.' Having slain in battle Jambha, Vritra, Vala, Paka, Satamaya, Virochana, the irresistible Namuchi, Samvara of innumerable illusions, Viprachitti,--all these sons of Diti and Danu, as also Prahlada, I myself have become the chief of the celestials.'