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This seems to appear in the Jhataka (in the Khuddaka-NikΓ’ya) literature: THE ATTAINMENT OF BUDDHASHIP in J.i.7110 marked as p. 76.
Then the Future Buddha turned his back to the trunk of the Bo-tree and faced the east. And making the mighty resolution, "Let my skin, and sinews, and bones become dry, and welcome! and let all the flesh and blood in my body dry up! but never from this seat will I stir, until I have attained the supreme and absolute wisdom!" he sat himself down cross-legged in an unconquerable position, from which not even the descent of a hundred thunder-bolts at once could have dislodged him.
At this point the god MΓ’ra, exclaiming, "Prince Siddhattha is desirous of passing beyond my control, but I will never allow it!" went and announced the news to his army, ...
The above page is linked/referenced on this index page as "i.685-772 (Β§ 8.), Intro".