So Joshua made flint knives and circumcised the Israelites on the Hill of the Foreskins. ¹ 

who turned a rock into a pool of water, a hard rock into springs of water! ¹ 

At that time the Lord told Joshua, “Make flint knives and circumcise the Israelites once again.” ¹ 

Their arrows are sharpened, and all their bows are prepared. ¹  The hooves of their horses are hard as flint, ²  and their chariot wheels are like a windstorm. ³ 

But Zipporah took a flint knife, cut off the foreskin of her son and touched it to Moses’ feet, ¹  and said, “Surely you are a bridegroom of blood ²  to me.”

But the sovereign Lord helps me, so I am not humiliated. For that reason I am steadfastly resolved; ¹  I know I will not be put to shame.

I have made your forehead harder than flint – like diamond! ¹  Do not fear them or be terrified of the looks they give you, ²  for they are a rebellious house.”

On the flinty rock man has set to work ¹  with his hand; he has overturned mountains at their bases. ² 

and who brought you through the great, fearful desert of venomous serpents ¹  and scorpions, an arid place with no water. He made water flow ²  from a flint rock and

I did this ¹  because I know how stubborn you are. Your neck muscles are like iron and your forehead like bronze. ² 

Indeed, they made their heart as hard as diamond, ¹  so that they could not obey the Torah and the other words the Lord who rules over all had sent by his Spirit through the former prophets. Therefore, the Lord who rules over all had poured out great wrath.

¹ The sin of Judah is engraved with an iron chisel on their stone-hard ²  hearts. It is inscribed with a diamond ³  point on the horns of their altars. ⁴ 

Abraham took the wood for the burnt offering and put it on his son Isaac. Then he took the fire and the knife in his hand, ¹  and the two of them walked on together.

Isaac said to his father Abraham, ¹  “My father?” “What is it, ²  my son?” he replied. “Here is the fire and the wood,” Isaac said, ³  “but where is the lamb for the burnt offering?”