כַּסְדַּי
Definition
כַּסְדַּי (Kaçday) is a proper noun referring to a Chaldean, specifically an inhabitant of the region of Chaldea in southern Mesopotamia. In its single biblical occurrence in Ezra 5:12, it is used in the plural form to denote the 'Chaldeans' as the people group who, under King Nebuchadnezzar, destroyed Jerusalem and exiled the Jewish people. This term is essentially a variant spelling of the more common כַּשְׂדִּי (Kasdiy, H3778), which appears frequently in books like Daniel and Jeremiah to describe both the Babylonian empire's people and, in Daniel, a class of wise men or astrologers (Daniel 2:2, 4:7).
Biblical Usage
This word is used only once in the Old Testament, in Ezra 5:12. In this context, it appears in a letter from regional officials to King Darius, recounting the history of Jerusalem's destruction. The speakers refer to the agents of that destruction as 'the Chaldeans' (כַּסְדַּיָּא). Its usage here is historical and ethnic, identifying the Babylonian forces without the additional connotation of 'wise men' found in the book of Daniel for the related term כַּשְׂדִּי.
Etymology
The word כַּסְדַּי is a variant orthography (spelling) of the more standard Hebrew כַּשְׂדִּי (Kasdiy, H3778), which itself derives from the Akkadian 'Kaldu,' referring to the land and people of Chaldea. The shift in the sibilant sound (from שׂ to ס) is a known phonetic variation in Biblical Aramaic and late Biblical Hebrew. It is an ethnonym, a name for a people group, and does not have a further analyzable Hebrew root.
Semantic Range
While the word itself is a simple ethnonym, the people it denotes—the Chaldeans—play a crucial theological role as instruments of God's judgment. Their conquest of Judah, as referenced in Ezra 5:12, fulfilled prophetic warnings of covenant curses for disobedience (e.g., Jeremiah 25:9-11). Later, in Daniel, the 'Chaldeans' as a class of wise men represent the pinnacle of pagan wisdom, which is consistently shown to be inferior to the wisdom and sovereignty of the God of Israel (Daniel 2:10-11, 27-28). Understanding this term connects a historical event to God's sovereign control over nations.
In the ancient Near East, 'Chaldean' originally referred to a Semitic tribe that settled in southern Babylonia. By the time of the Neo-Babylonian Empire (7th-6th centuries BC), the term became synonymous with the ruling class of Babylon. In the book of Daniel, written in Aramaic, 'Chaldeans' (כַּשְׂדַּיִן) also denotes a specific guild of priests, astrologers, and diviners who served the king. The variant in Ezra reflects the Aramaic linguistic influence on post-exilic Hebrew and would have been immediately understood by its original audience as referring to the Babylonian conquerors.
כַּשְׂדִּי (Kasdiy, H3778) — The standard Hebrew/Aramaic term for Chaldean, used far more frequently and with the same core meaning, including the specialized sense of 'wise men' in Daniel. בָּבֶל (Bavel, H894) — 'Babylon,' the empire and capital city with which the Chaldeans were closely associated. כַּשְׂדִּימָה (Kasdiymah, H3779) — 'Chaldea,' the land or region of the Chaldeans.
Word Details
How this works
Hebrew definitions are from Brown-Driver-Briggs (1906) and Strong's Exhaustive Concordance (1890), both public domain. BDB was groundbreaking for its era but reflects 19th-century assumptions about Semitic etymology. Modern scholarship (HALOT, DCH) has revised many entries. Use these definitions as a starting point for exploration, not as the final word on a term's meaning in context.
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