Deuteronomy 7:21
19 the great judgments you saw, the signs and wonders, the strength and power by which he brought you out—thus the Lord your God will do to all the people you fear. 20 Furthermore, the Lord your God will release hornets among them until the very last ones who hide from you perish. 21 You must not tremble in their presence, for the Lord your God, who is present among you, is a great and awesome God. 22 He, the God who leads you, will expel the nations little by little. You will not be allowed to destroy them all at once lest the wild animals overrun you. 23 The Lord your God will give them over to you; he will throw them into a great panic until they are destroyed.
Nehemiah 4:14
12 So it happened that the Jews who were living near them came and warned us repeatedly about all the schemes they were plotting against us. 13 So I stationed people at the lower places behind the wall in the exposed places. I stationed the people by families, with their swords, spears, and bows. 14 When I had made an inspection, I stood up and said to the nobles, the officials, and the rest of the people, “Don’t be afraid of them. Remember the great and awesome Lord, and fight on behalf of your brothers, your sons, your daughters, your wives, and your families!” 15 It so happened that when our adversaries heard that we were aware of these matters, God frustrated their intentions. Then all of us returned to the wall, each to his own work. 16 From that day forward, half my men were doing the work and half were taking up spears, shields, bows, and body armor. Now the officers were behind all the people of Judah
Notes and References
"... Although the Old Testament attributes relatively few predicates to God himself, the use of “el” in connection with adjectives becomes more frequent in later times, from about Deuteronomy onward; the word can assume a wide variety of modifiers on account of its generality. The “jealous God” watches over Israel, who trusts in strange gods; the “holy God” (Isaiah 5:16) proves himself to be holy in judgment. Yet the “great God” (Psalm 95:3) can intercede for Israel (Deuteronomy 7:21; 10:17) and forgive sin just as easily (Jeremiah 32:18; compare Nehemiah 1:5; 9:32; Daniel 9:4). In a manner unusual for the Old Testament, the confession formulae “merciful and gracious God,” etc. (Exodus 34:6; compare Deuteronomy 4:31; Jonah 4:2; Psalm 86:15; Nehemiah 9:31), also attested only late, do not appeal to a historical event; they have origins in wisdom, which makes a basic, universally valid statement concerning God’s being, so that one can find here the origins of a doctrine of God’s attributes ..."
Jenni, Ernst, and Claus Westermann Theological Lexicon of the Old Testament (pp. 186-187) Hendrickson Publishers, 1997