“And the L-RD said unto Moses: Go in unto Pharaoh; for I have hardened his heart, and the heart of his servants, that I might show these My signs in the midst of them.’” – Exodus 10:1, JPS 1917 Tanach
According to the Zohar, when Moses entered Pharaohs inner chamber, considered to be the abode of evil, HShems Presence was with him. This is drawn from the translation of the word, bo, as meaning “come” to Pharaoh, instead of “go” to Pharaoh. Because H’Shem said to Moses, in a manner of speaking, come with me, into the abode of the serpent, and My Presence will be with you when you confront Pharaoh. To some degree, what is written in the Zohar seems to imply that this inner chamber was actually a spiritual abode of darkness, as if Moses was brought face to face with the power of the serpent that sustained Pharaoh and all of Egypt. The only reason that this would be necessary is to break that power through G-d’s might.
Moshe may have also felt some trepidation about confronting Pharaoh within the court this time. Having grown up in the previous Pharaoh’s court, he knew full well the level of darkness in the form of idolatry, present within Pharaoh’s inner chambers. The servants of Pharaoh were well skilled in the ways of darkness associated with these deities. Their so-called powers were not from G-d; rather, their strength was dependent upon the sitra achrah, literally, “the other side.” This is why the Zohar refers to Pharaoh’s inner chamber as the abode of evil; for in the absence of G-d, there is only evil.
Yet, H’Shem reassured Moshe, that He would be present with Him, even in this darkest of abodes. At this point, Moses, accompanied by Aaron, delivered the warning for the eighth plague – the plague of locusts. The description of the plague was severe enough that “Pharaoh’s servants said unto him: ‘How long shall this man be a snare to us? let the men go, that they may serve the L-RD their G-d, knowest thou not yet that Egypt is destroyed?” (Exodus 10:7, JPS 1917 Tanach). It is the nature of evil, that when it lifts up its ugly head, it does so in insolent pride against G-d – for Pharaoh did not relent.