Fourth Book of Kings (Author Compiled by Isaias and Jeremias from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
2:9cumque transissent Helias dixit ad Heliseum postula quod vis ut faciam tibi antequam tollar a te dixitque Heliseus obsecro ut fiat duplex spiritus tuus in me
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.