Buddhacarita by Ven Asvaghosa - Ancient Buddhist Texts

Buddha-carita, or Life of Buddha - 158
Aśvattha tree, where the surface of the ground was covered with
young grass.
113. Then Kāla, the best of serpents, whose majesty was like the lord
of elephants, having been awakened by the unparalleled sound of his
feet, uttered this praise of the great sage, being sure that he was on
the point of attaining perfect knowledge:
114. ‘Inasmuch as the earth, pressed down by thy feet, O sage,
resounds repeatedly, and inasmuch as thy splendour shines forth like
the sun, thou shalt assuredly to-day enjoy the desired fruit.
115. ‘Inasmuch as lines of birds fluttering in the sky offer thee
reverential salutation, O lotus-eyed one, and inasmuch as gentle
breezes blow in the sky, thou shalt certainly to-day become the
Buddha.’
116. Being thus praised by the best of serpents, and having taken some
pure grass from a grasscutter, he, having made his resolution, sat
down to obtain perfect knowledge at the foot of the great holy tree.
117. Then he sat down on his hams in a posture, immovably firm and
with his limbs gathered into a mass like a sleeping serpent’s hood,
exclaiming, ‘I will not rise from this position on the earth until I have
obtained my utmost aim.’