Shmuel Bais 18:9-10

And Avshalom met the avadim of Dovid. And Avshalom rode upon a pered (mule), and the pered went under the thick boughs of a great oak, and his rosh (head) caught hold of elah (tree, oak), and he was suspended between HaShomayim and ha'aretz; the pered under him went on. And a certain ish saw it, told Yoav, and said, Hinei, I saw Avshalom talui (hanged) b'elah (on a tree, oak).