Parallel
Joshua 11:20
Brenton's English Septuagint · Berean Standard Bible
For it was of the Lord to harden their hearts to go forth to war against Israel, that they might be utterly destroyed, that mercy should not be granted to them, but that they should be utterly destroyed, as the Lord said to Moses.
For it was of the LORD to harden (note: Or stiffen or strengthen) their hearts to engage Israel in battle, so that they would be set apart for destruction and would receive no mercy, being annihilated as the LORD had commanded Moses.