Bhagavad Gita: Chapter 1, Verse 10

अपर्याप्तं तदस्माकं बलं भीष्माभिरक्षितम् ।
पर्याप्तं त्विदमेतेषां बलं भीमाभिरक्षितम् ॥ १-१०॥

aparyāptaṃ tad asmākaṃ balaṃ bhīṣmābhirakṣitam
paryāptaṃ tvidam eteṣāṃ balaṃ bhīmābhirakṣitam 1.10

The strength of our army is immeasurable, and we are perfectly protected by grandsire Bhisma, whereas the strength of the Pandavas, carefully protected by Bhima is limited.