Holy Zohar text. Daily Zohar -65.

כה is the supernal Shechina, which is Binah dressed in with the energy of Zeir Anpin and with that force the Israelites left Egypt. As it said
” כה אמר יהוה כחצות הלילה”
“So said YHVH…” The first two letters is כה and the first letters of the third and fourth words begin with כה. This verse from Exodus 11:4 begins the Exodus process and it tells the powers involved.

The two letters כה connect the prayer of Shema to Binah when they recite twice a day. It creates a unification of the supernal mother and father with the elevation of Zeir Anpin with the word אחד Echad, (=one=love). The first 22 letters build the channel and the energy for the last 3 letter to create the unification and reveal the upper light below.

מקור הקטע: הקדמת תיקוני הזוהר עם פרוש מעלות הסולם (רבי יהודה צבי ברנדויין זל) פסק 319