Hora’ah – הוראה – Teaching
“The main guarantor is the soul of Mashiach, which is the collective soul of all tzaddikim throughout the generations. Mashiach will complete all rectifications (tikkunim) and fix all the damage that was incurred throughout history. This is why Mashiach suffers on behalf of all Israel—because he serves as guarantor for them all. Therefore, Dovid HaMelekh, who was the Mashiach, entreats God, “Be surety for Your servant for good…” (Psalms 119:122). That is, [he declares before God,] “Behold, I have been made a guarantor on behalf of all [at the beginning of the Divine plan, prior to creation]. And no one can stand up to help me fulfill my obligation but You alone!” Thus, he entreats, “Be surety for Your servant for good.”
Likutey Halakhos, Arev 4:3,4
“It says in the Holy Zohar, Hashem asked Moshiach ‘should I make the world or not? Because man will rebel against me!’ Moshiach said, “put it all on me I’ll pay the debt”. The Zohar says that all our avodah (divine service) has no substance at all. So this Neshama of Moshiach, this soul – the same exact soul as Moshe rebbenu, Rashbi, the Baal Shem Tov and Rebbenu Nachman, says he’ll take responsibility. When seeing the days before Moshiach, the malachim (angels) asked “who will pay the chov (debt), Mah Yiye? What will be?” Moshiach stood up and said “I will, I’m the Guarantor!“
The Tzadik Emet – Part 3, Rabbi Nati, Mystical Paths
“The Messiah is Israel’s guarantor; he has undertaken suffering to atone for Israel’s sins in order to shorten the exile (Yalkut Shimoni 499).”
Ben Ish Chai, Aderet Eliyahu, Haftarat Yitro, Days of Peace, Yeshivat Ahavat, Shalom Publications, pp. 127
1. The soul of Mashiach preceded the world. It is the root of the souls of Israel, and the entire Creation, for “The entire universe was only created to attend him” (Berakhot 6b) and “The Tzaddik is the foundation of the world” (Proverbs 10:25).
2. The Holy One, blessed-be-He, took counsel with this soul in the creation of His Universe, as it is written: “With whom did He take counsel, who gave Him understanding and guided Him in the way of judgment?” (Isaiah 40:14).
3. He gave God a guarantee that he will repair the Universe.
From The Seventh Pillar: The Tzaddik
And inasmuch as He was not made priest without an oath (for they have become priests without an oath, but He with an oath by Him who said to Him: “The Lord has sworn and will not relent, ‘You are a priest forever accirding to the order of Melchizedek’”) by so much more Jesus has become a surety of a better covenant.