Numbers 5:28

5:28 But if the woman has not defiled herself, and is clean, then she will be free of ill effects and will be able to bear children.

Numbers 13:30-31

13:30 Then Caleb silenced the people before Moses, saying, “Let us go up and occupy it, for we are well able to conquer it.” 13:31 But the men who had gone up with him said, “We are not able to go up against these people, because they are stronger than we are!”

Numbers 14:16

14:16 ‘Because the Lord was not able to bring this people into the land that he swore to them, he killed them in the wilderness.’