Likutei Moharan 44:7/ליקוטי מוהר"ן מ״ד:ז׳

17. Another explanation: “Prayers <were established> to parallel the regular-offerings.” The explanation is: Through prayer there is a revelation of the Torah’s mysteries, which are called “the mysteries of the world”— KaVShei (mysteries of) the Merciful One, as is written (Proverbs 27:26), “KVaSim (sheep) to provide you with clothing.” {As our Sages taught on this verse: Matters which are the KaVShei (mysteries of) the world….} And the regular-offerings are sheep, as is written (Numbers 28:4), “Prepare one sheep in the morning [and prepare a second sheep in the afternoon].”

2Thus through <the> prayers, the Torah’s mysteries are revealed, as is brought concerning the verse (Isaiah 43:2), “When you cross through the water, I am with you.”