Interesting evidence of the essential link between Yahweh and copper metallurgy is provided by the story of the first 'encounter' between Moses and Yahweh on Mt Horeb, near the 'burning bush' (Exod. 3)...

...Moses had to perform a 'prodigy' in order to demonstrate that he acts in the name of Yahweh (Exod. 4.5). This prodigy is depicted as the reversible transformation of a matteh into a nahash (Exod. 4.2-5).

The term matteh is generally understood as designating a wood-made staff, but this meaning is probably secondary. From Isa. 10.15 and Ezek. 19-13-14 it appears that a matteh was formerly a copper scepter hung up on a wooden staff.

The term nahash is generally translated as 'serpent'. However, the closeness existing in Hebrew between nahash ('serpent') and nehoshet ('copper') suggests that nahash may also designate copper. [The term nahash designates copper in Ugaritic, Aramaic, and Arabic. In 1 Chron. 4.11-12, Ir Nahash is founded by Caleb, a clan of metalworkers, and designates it as a place of copper smelting/working.]

Accordingly, the prodigy performed 'in the name of Yahweh' becomes the transformation of a copper artifact...into melted copper.

...If the reversible matteh-nahash conversion is considered in the book of Exodus as a specific sign of Yahweh, this implies that this deity was intimately associated with copper melting, at least in the period prior to the Israelite Alliance.

(pp. 395-396)

(from 'Yahweh, the Canaanite God of Metallurgy?', JSOT 33.4 (2009): 387-404)

According to the books of Kings, a bronze serpent called Nehushtan was worshipped at Jerusalem until the reign of Hezekiah (2 Kgs 18.4). Since this cult of a bronze serpent is not explicitly condemned as idolatry by the author of the book of Kings, it is likely that it was related to the (former) cult of Yahweh. Furthermore, it is claimed in the book of Numbers that this bronze serpent was made by Moses 'in the name of Yahweh' (Num. 21.-8-9). (p. 399)

(from 'Yahweh, the Canaanite God of Metallurgy?', JSOT 33.4 (2009): 387-404)

The intimate link existing between Yahweh and the Kenites is strengthened by the following observations:

1. The first mention of Yahweh (neither Elohim nor Yahweh-Elohim) in the book of Genesis is related to the birth of Cain: 'Now the man knew his wife Even, and she conceived and bore Cain, saying, "I have produced a man with the help of the LORD"' (Gen. 4.1). This may be a symbolic way to claim that the 'discovery' of Yahweh is concomitant to the discovery of metallurgy.

2. Enosh is mentioned in Genesis as the first man who worshipped Yahweh: 'To Seth also a son was born, and he names him Enosh. At that time people began to invoke the name of the LORD' (Gen. 4.26). Interestingly, Enosh is the father of Keynan (= Cain). Again, the worship of Yahweh appears to have been linked to the discovery of metallurgy.

3. The Kenites had a sign (taw) on their forehead. From Gen. 4.15, it appears that this sign signalled that Yahweh protects Cain and his sons. From Ezek. 9.4-6, it seems that, at the end of the First Temple period, a similar sign remained the symbol of devotion to Yahweh.

4. The book of Jeremiah confirms the existence of a Kenite worship of Yahweh as follows:'Jonadab son of Rechab shall not lack a descendant to stand before me [Yahweh] for all time' (Jer. 35.19). This fidelity of smelters and smiths to the initial Yahwistic tradition may explain why the liberators of Judah, Israel and Jerusalem are depicted as smiths in the book of Zechariah (Zech. 2.3-4).

When considered together, these data suggest that Yahweh was intimately related with the metallurgists from the very discovery of copper smelting. (pp. 393-394)

from 'Yahweh, the Canaanite God of Metallurgy?', JSOT 33.4 (2009): 387-404

If confirmed by further investigations, the identification of Yahweh as the Canaanite god of metallurgy may have significant implications for the way we approach the history of Israel and the emergence of monotheism.

First, the worship of Yahweh suddenly emerging with the Israelite Alliance becomes an Iron Age movement, the popularization of the beliefs of the Canaanite smelters. In this case, the novelty of the Israelite Alliance consists of the transformation of the (initiatory) cult of the Canaanite guild of copper smelters into a public cult.

Second, the uncompromising attitude observed in Israel towards deities other than Yahweh becomes a resurgence of a very ancient tradition, that of the Canaanite smelters, challenging the current gradualist view of emergence of monotheism from monolatry and henotheism.

Third, it seems that many of the biblical writings include traces of very ancient traditions, including those of the Canaanite metallurgists from the Bronze Age. Their identification and their comparison with other metallurgical traditions may be a tool that can be used in the identification of the various strata of redaction of the biblical texts. (p. 403)

(from 'Yahweh, the Canaanite God of Metallurgy?', JSOT 33.4 (2009): 387-404)

An essential link between Yahweh and copper is suggested in the book of Zechariah, where the dwelling of the God of Israel is symbolized by two mountains of copper (Zech. 6.1-6).

In his prophecies, Ezekiel describes a divine being as 'a man was there, whose appearance shone like copper' (Ezek. 40.3), and in another part of this book, Yahweh is even explicitly mentioned as being a smelter (Ezek. 22.20).

A similar association is encountered in the book of Zechariah (Zech. 13.9). It is interesting to notice that these visions are not simple popular metaphors. Both Ezekiel and Zechariah described processes of metal purification (fractionation through melting for Ezekiel and cupellation for Zechariah), suggesting that the authors of these two books had a deep knowledge not only of Yahwistic traditions, but also of metallurgy. (p. 394)

from 'Yahweh, the Canaanite God of Metallurgy?', JSOT 33.4 (2009): 387-404

A singular statement of commitment of Yahweh towards Egypt appears in the book of Isaiah: 'The Lord will strike Egypt, striking and healing; they will return to the Lord, and he will listen to their supplicants and heal them' (Isa. 19.22). A similar promise concerning Yahweh's redemption of Egypt is also found in the book of Ezekiel [29.13-14].

Moreover, Egyptians are considered as being circumcised (Jer. 9.24), a detail generally mentioned in order to distinguish the people belonging to the Alliance of Yahweh from others. This is mentioned especially concerning the king of Egypt (Ezek. 31.18).

(p. 402)

(from 'Yahweh, the Canaanite God of Metallurgy?', JSOT 33.4 (2009): 387-404)