Likutei Moharan, Part II 5:12/ליקוטי מוהר"ן·תנינא ה׳:י״ב

112. And when the perversion of mishpat brings about the aforementioned defilement, the only way to rectify this is by assembling the Chariot. It is necessary to assemble the Chariot, as in “its chariot of ARGaMaN (purple)”—referring to the angels of the Chariot, Refael, Gavriel, and so on, as is brought. One has to bind them together in order to rectify the blemish of the Chariot, from which the fallen loves come.

2This is the reason the early sages instituted reciting the “Assembling of the Chariot” before going to sleep: “To my right, Mikhael; to my left, Gavriel….” By assembling the Chariot, one is spared from the aforementioned defilement.