An impure quartz rock, usually gray, brown, or black, abundant in Palestine. It fractures on conchoidal lines and holds an extremely sharp edge, either smooth or serrated. It was used for a variety of tools, such as awls, axes, knives, picks, scrapers, sickles, and weapons (arrowheads and spear points). Knives used for circumcision were made of flint (Exod 4:25; Josh 5:2; Josh 5:3). Flint serves as a metaphor for sharp-cutting destructive power (Isa 5:28) and stubborn faithfulness (Isa 50:7) and is a dubious source of water (Ps 114:8; Deut 8:15). It can be manipulated by humans (Job 28:9), but is a most unlikely source of any nourishment (Deut 32:13).

Exod 4:25

25But Zipporah took a flint and cut off her son's foreskin, and touched Moses' feet with it, and said, “Truly you are a bridegroom of blood to me!”

Josh 5:2

2At that time the Lord said to Joshua, “Make flint knives and circumcise the Israelites a second time.”

Josh 5:3

3So Joshua made flint knives, and circumcised the Israelites at Gibeath-haaraloth.

Isa 5:28

28their arrows are sharp,
all their bows bent,
their horses' hoofs seem like flint,
and their wheels like the whirlwind.

Isa 50:7

7The Lord GOD helps me;
therefore I have not been disgraced;
therefore I have set my face like flint,
and I know that I shall not be put to shame;

Ps 114:8

8who turns the rock into a pool of water,
the flint into a spring of water.

Deut 8:15

15who led you through the great and terrible wilderness, an arid wasteland with poisonous snakes and scorpions. He made water flow for you from flint rock,

Job 28:9

9“They put their hand to the flinty rock,
and overturn mountains by the roots.

Deut 32:13

13He set him atop the heights of the land,
and fed him with produce of the field;
he nursed him with honey from the crags,
with oil from flinty rock;

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