The construction "Holy of Holies" is a translation of the Hebrew (Tiberian Hebrew: "Qṓḏeš haQŏḏāšîm") which is intended to express a superlative. Examples of similar constructions are "servant of servants" (Gen 9:25), "Sabbath of sabbaths" (Ex 31:15), "God of gods" (Deut 10:17), "Vanity of vanities" (Eccl 1:2), "Song of songs" (Song of Songs 1:1), "king of kings" (Ezra 7:12), etc. The Bible distinguishes the proper noun "Holy of Holies" from the honorific by the definite article, viz. "Qṓḏeš HaQŏḏāšîm" is the room and "Qṓḏeš Qŏḏāšîm" is used otherwise. This adds an additional level of superlativity; the only matching example of the prior set is "God of gods" in Deuteronomy.