O ye who cancel decrees, who annul vows, who avert wrath, who quiet jealousy, who cause love to be remembered, who set forth friendship before the loftiness of the majesty of the fearful palace, what aileth ye that ye be fearful and there be times when ye rejoice? What aileth ye that ye do sing for exultation, and there be times when ye are terrified? They said: “When the ophanim of the power of God darken the Merkabha we rejoice with great joy.” (As it is said, “Holy, holy, holy is the Lord of Hosts.”)
Angels Who Cancel Decrees and Avert Divine Wrath
Heikhalot Rabbati 9:5