Talmud zu Tehillim 77:78

They came back and asked him: What is that which is written (Jos. 24:19): “For He is a holy God.” He answered them, it is not written: “they”, but “He,” “He is a jealous God.” His students told him: Teacher, these you pushed away with a stick, what can you answer us? Rebbi Isaac said, He is holy in all kinds of holiness, as Rebbi Yudan said in the name of Rebbi Aḥa: The Holy One, praise to Him, is holy in all kinds of holiness. His speech is in holiness, His throning is in holiness, the baring of His arm is in holiness, God is awesome and majestic in holiness. His way is in holiness, (Ps. 77:14) “God, Your way is in holiness.” His walking is in holiness, (Ps. 68:25) “the course of my God, my King, in holiness.” His throning is in holiness, (Ps. 47:9) “God throned on His holy throne.” His speech is in holiness, (Ps. 60:8) “God spoke [in His holiness].” The baring of His arm is in holiness, (Is. 52:10) “The Eternal bared His holy arm.” He is awesome and glorious in holiness, (Ex. 15:11) “Who is like You, glorious in holiness!”