“It is this contact, connection, or communio with God that is designated by the Hebrew term debhequth. This kabbalistic concept has its origins in the terminology of the medieval Jewish theologians, especially Bahya ibn Paquda and Abraham ibn Ezra, who employed the biblical verb dabhaq (“adhere, cleave to,”) to express the contact of the soul with God or the divine light. The biblical injunction Deuteronomy 13:5 is cited by Isaac’s pupils as their master’s cue for this doctrine:
“ … Our master the Hasid said: The essential thing in the divine service of the mystics [maskilim] and those who meditate on His name, lies in this [verse]: “and cleave to Him.” And this is a cardinal principle of Torah and of prayer, that one make one’s thought conform with one’s faith, as though it were cleaving to what is above, in order to conjoin the name [of God] in its letters and to link the ten sefiroth to Him as a flame is joined to the coal. With his mouth he must express it according to its paraphrase, but in his heart, he must conjoin it in its true structure.”
Debhequth is therefore not unio but communio. In the sense the term acquired in kabbalistic usage it always contains an element of distance despite its character of intimacy. Debhequth is not becoming one with God but entering into an infinitely close liaison with him, roughly corresponding to that called adhaeresis by medieval Christian mystics.
In Hebrew, debhequth can denote the process as well as the state attained through it. The instrument of this process is the kawwanah. Isaac and his disciples do not speak of ecstasy, of a unique act of stepping outside oneself in which human consciousness abolishes itself.
Debhequth does not consist in tempestuously rushing toward God and becoming absorbed in him; it is a constant state, nurtured and renewed through meditation. In contrast to some later schools, the old kabbalists did not go any further, and in this remained true to their Jewish-theistic character. For them, debhequth or the mystical communio is not, as for many non-Jewish mystics, a transitional stage leading to still higher regions.
Any pantheistic overstepping of the limits they fixed for themselves in their interpretation of the mystical path is far from their thoughts.”
Gershom Scholem, Origins of the Kabbalah, pp. 302-3