Likutei Moharan 278:1/ליקוטי מוהר"ן ער״ח:א׳

1Know! on a flawless slaughter knife it is possible to see how all the utensils of the Holy Temple look. This is what is written: When Yitzchak instructed Esav to inspect his knife and slaughter well, [he said,] “Take your utensils, [your sword…]” (Genesis 27:3). This hints to the utensils of the Holy Temple, which are visible on a proper knife, as explained above.

2And the Midrash likewise brings that “your utensils” alludes to the utensils of the Holy Temple, as [the Sages] said there: “your utensils”—this is Babylon, as is said (Daniel 1:2), “and the utensils he brought to the treasury of his god” (Bereishit Rabbah 65:13). Thus it is that “your utensils” alludes to the utensils of the Holy Temple.

3“By his being jealous for My jealousy” (Numbers 25:11)—[this is] the aspect of the tzaddik who is jealous of no other tzaddik, neither in this world nor the next, but only of God Himself.