Bhagavad Gita - Chapter 1 - Vishada Yoga -Lamenting the Consequence of War- Verse 10
aparyāptaḿ tad asmākaḿ
balaḿ bhīṣmābhirakṣitam
paryāptaḿ tv idam eteṣāḿ
balaḿ bhīmābhirakṣitam
Translation of Bhagavad Gita 1.10
Our strength is immeasurable, and we are perfectly protected by Grandfather Bhishma, whereas the strength of the Pandavas, carefully protected by Bhima, is limited.