Mahabharata 3.163.49

उवाच च महादेवो दत्त्वा मेऽस्त्रं सनातनम्न प्रयोज्यं भवेदेतन्मानुषेषु कथंचन

uvāca ca mahādevo dattvā me'straṃ sanātanamna prayojyaṃ bhavedetanmānuṣeṣu kathaṃcana

Our plain-language meaning of this verse is waiting for scholar review.