Mahabharata 8.5.76

न हन्यामर्जुनं यावत्तावत्पादौ न धावयेइति यस्य महाघोरं व्रतमासीन्महात्मनः

na hanyāmarjunaṃ yāvattāvatpādau na dhāvayeiti yasya mahāghoraṃ vratamāsīnmahātmanaḥ

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