'Adequate' in the Bible

They returned and reported to Joshua, "Don't send the whole army. About two or three thousand men are adequate to defeat Ai. Don't tire out the whole army, for Ai is small."

Now who indeed has adequate strength to build a house for him? For the heavens and {the highest heavens} are not able to contain him. Now who [am] I that I would build a house for him, except to burn incense before him?

Certainly a man cannot rescue his brother; he cannot pay God an adequate ransom price