Сефер Йецира
As Aryeh Kaplan explains in his translation and commentary on the "Sefer Yetzirah", "Although the Sefer Yetzirah does not name the Ten Sefirot, their names are well known from the classical Kabbalah. ... The names of the Sefirot are all derived from scripture." The "classical Kabbalah" Kaplan refers to is above all encapsulated in the Zohar and the later works derived from it. According to those sources, the sefirot are often given diverse names, but the chiefly used terms are: