" But ye that did cleave unto the Lord your God are alive every one of you this day" (Deut. iv. 4). Is it possible to cleave to the Shechinah? Is it not written {ibid., verse 24), " For the Lord thy God is a consuming fire,)? The reply is: — He that bestows his daughter in marriage on a disciple of the wise (that is, a Rabbi), or does business on behalf of the disciples of the wise, or maintains them from his property, Scripture accounts it as if he did cleave to the Shechinah. {Kethuboth, fol. Ill, col. 25.)
How a Jew Cleaves to the Shechinah Without Being Burned
Ketubot 111b (Hebraic Literature, 1901)