Zakharia 7:12

7:12 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.

Zakharia 9:15

9:15 The Lord who rules over all will guard them, and they will prevail and overcome with sling stones. Then they will drink, and will become noisy like drunkards, ²  full like the sacrificial basin or like the corners of the altar. ³ 

[7:12]  ¹ tn The Hebrew term שָׁמִיר (shamir) means literally “hardness” and since it is said in Ezek 3:9 to be harder than flint, many scholars suggest that it refers to diamond. It is unlikely that diamond was known to ancient Israel, however, so probably a hard stone like emery or corundum is in view. The translation nevertheless uses “diamond” because in modern times it has become proverbial for its hardness. A number of English versions use “flint” here (e.g., NASB, NIV).

[9:15]  ² tn Heb “they will drink and roar as with wine”; the LXX (followed here by NAB, NRSV) reads “they will drink blood like wine” (referring to a figurative “drinking” of the blood of their enemies).

[9:15]  ³ sn The whole setting is eschatological as the intensely figurative language shows. The message is that the Lord will assume his triumphant reign over all the earth and will use his own redeemed and renewed people Israel to accomplish that work. The imagery of v. 15 is the eating and drinking of the flesh and blood of God’s enemies, that is, Israel’s complete mastery of them. Like those who drink too much wine, the Lord’s warriors will be satiated with the blood of their foes and will exult as though drunk.