Rabbi Berakhiah said in the name of Rabbi Abba the Edomite: What is the meaning of "holy ones" [kedoshim] (Joshua 24:19)? That He is holy in every kind of holiness. Rabbi Acha said in the name of Rabbi Chanina: His way is in holiness, as it is said, "O God, Your way is in holiness" (Psalms 77:14). His going is in holiness, as it is said, "They have seen Your goings, O God, the goings of my God, my King, in the sanctuary" (Psalms 68:25). He is seen in holiness, "So I have looked upon You in the sanctuary" (Psalms 63:3). His speech is in holiness, "God has spoken in His holiness" (Psalms 60:8). The baring of His arm is in holiness, as it is said, "The LORD has bared His holy arm" (Isaiah 52:10). He is lovely and majestic in holiness, as it is said, "Who is like You among the gods, O LORD" and so forth (Exodus 15:11). Thus, "For He is a holy God," that He is holy in every kind of holiness.
Holy in Every Kind of Holiness
Yalkut Shimoni on Nach 33:2
א"ר ברכיה בש"ר אבא האדמוני מהו קדושים שהוא קדוש בכל מיני קדושות. א"ר אחא בש"ר חנינא דרכו בקדושה שנאמר אלהים בקדש דרכך. הלוכו בקדושה שנאמר הליכות אלי מלכי בקדש. נראה בקדושה כן בקדש חזיתיך. דבור בקדושה ה' אלהים דבר בקדשו. חשיפת זרועו בקדושה שנאמר חשף ה' את זרוע קדשו.. נאה ואדיר בקדש שנאמר מי כמוכה באלים ה' וגו', הוי כי אלהים קדושים הוא שהוא קדוש בכל מיני קדושות: