How is it possible to cleave to Hashem, who is compared to a consuming fire?
Kesuvos, 111b: 'Whoever marries off his daughter to a Talmid-Chacham, who does business with a Talmid-Chacham or who benefits a Talmid-Chacham from his property is considered as if he is cleaving to the Shechinah.'
Hadar Zekenim: One can cleave to Hashem's Mitzvos.
Mesilas Yesharim (Perek 19): One can cleave to Hashem to the point that he ceases to pay attention to anything else. 1
Targum Onkelos and Targum Yonasan: The Torah is referring to those those who cleave to Yir'as Hashem.
Though this does not seem to answer the question.
What are the connotations of this Pasuk?