Pasuk 3

אִם תַּחֲנֶה עָלַי מַחֲנֶה לֹא יִירָא לִבִּי אִם תָּקוּם עָלַי מִלְחָמָה בְּזֹאת אֲנִי בוֹטֵחַ.

Were an army to gather against me, if war were to come upon me, in this I trust.

The word בזאת (in this) has echoes of Yom Kippur, בזאת יבא אהרן אל הקדש, in this manner shall Aharon enter the Holy.

The Bais HaMikdosh (Temple) was a warp in the time-space continuum. The Talmud tells us that the לחם הפנים, the showbread, sat out for over a week without cooling or getting stale. In the קדש הקדשים, the Holy of Holies, the Ark took up no physical space. The laws of physics, the workings of time and space, were suspended. This was where the populace would come on the Holidays to witness these warps in the fabric of the Universe and to understand by extension the love God has expressed through the miracle of Creation.

And what was found within the space warp that was the place of the Ark? On top of the Ark were two Cherubs and they would be seen hugging each other to symbolize the love that Hashem has for us. The love that led Him to transcend His omnipresence and create a place for our existence.

Within this existence it is all too easy to forget about the existence of Hashem. As we get lost within the vicissitudes of life and allow fears to overwhelm us God seems to be absent. We see no place for miracles. Transcending what appears to be inevitable seems impossible.

As Dovid stood, surrounded by enemies and seeing war come upon him, he often found himself in situations that seemed hopeless. A lesser man (like Shaul) might have succumbed to the evidence of impending disaster that surrounded him. But Dovid trusted in בזאת, he thought about the Holy of Holies and the demonstration there of Hashem's omnipotence. He thought about the love of Hashem that was evident within that warp. And he was reminded that even here in this world there is a power that can warp what seem to be the rules of normalcy and bring about a miraculous outcome.