Deut 20:
16 But of the cities of these people, which the LORD thy God doth give thee for an inheritance,
thou shalt save alive nothing that breatheth:
17 But thou shalt utterly destroy them; namely, the Hittites, and the Amorites, the Canaanites,
and the Perizzites, the Hivites, and the Jebusites; as the LORD thy God hath commanded thee:
Israel failed in this. The giants were finally utterly destroyed by the four kings under Chedorlaomer.
Gen 14:
5 And in the fourteenth year came Chedorlaomer, and the kings that were with him, and smote the Rephaims in Ashteroth Karnaim, and the Zuzims in Ham, and the Emims in Shaveh Kiriathaim,
6 And the Horites in their mount Seir, unto El-paran, which is by the wilderness.
7 And they returned, and came to En-mishpat, which is Kadesh, and smote all the country of the Amalekites, and also the Amorites that dwelt in Hazezon- tamar.
8 And there went out the king of Sodom, and the king of Gomorrah, and the king of Admah, and the king of Zeboiim, and the king of Bela (the same is Zoar and they joined battle with them in the vale of Siddim;
9 With Chedorlaomer the king of Elam, and with Tidal king of nations, and Amraphel king of Shinar, and Arioch king of Ellasar; four kings with five.
The names of the clans of giants are named here: Gen 15:19-21
The Kenites, and the Kenizzites, and the Kadmonites, And the Hittites, and the Perizzites, and the Rephaims, And the Amorites, and the Canaanites, and the Girga****es, and the Jebusites.
The giants are also translated as "dead" or "deceased". They have no resurrection.
- 2 Samuel 16:23 (KJV)
And the counsel of Ahithophel, which he counselled in those days, was as if a man had enquired at the oracle of God: so was all the counsel of Ahithophel both with David and with Absalom.