Also the Prophet Nehemiah makes the same claims in
Nehemiah 9:8.
"And foundest his heart faithful before thee, and madest a covenant with him to give the land of the Canaanites, the Hittites, the Amorites, and the Perizzites, and the Jebusites, and the Girgashites, to give it, I say, to his seed, and hast performed thy words; for thou art righteous:"
The Bible testifies that Joshua was telling the truth.