Saṃyutta Nikāya 4
Connected Discourses with Mara
2. The King Elephant
Thus have I heard. On one occasion the Blessed One was dwelling at Uruvela on the bank of the river Nerañjara at the foot of the Goatherd’s Banyan Tree just after he had become fully enlightened. Now on that occasion the Blessed One was sitting out in the open air in the thick darkness of the night while it was drizzling.
Then Mara the Evil One, wishing to arouse fear, trepidation, and terror in the Blessed One, manifested himself in the form of a giant king elephant and approached the Blessed One. His head was like a huge block of steatite; his tusks were like pure silver; his trunk was like a huge plough pole.