Mahabharata 10.8.117

न देवासुरगन्धर्वैर्न यक्षैर्न च राक्षसैःशक्यो विजेतुं कौन्तेयो गोप्ता यस्य जनार्दनः

na devāsuragandharvairna yakṣairna ca rākṣasaiḥśakyo vijetuṃ kaunteyo goptā yasya janārdanaḥ

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