Is it true? No.

They certainly did fight wars, and God sometimes* told them to. However, they were under the Law of Moses and the Old Covenant, and we who are Christians are not. God also told them to marry their dead brother’s wife to have children for him if he didn’t have any—I have never yet heard any Christian clamoring to do that!

We are under the New Covenant with teachings by Jesus that are more profound and far-reaching. Jesus commanded his followers, “Love your enemy” (Matthew 5:43-48).

“My kingdom is not of this world. If it were, my servants would fight to prevent my arrest by the Jewish leaders. But now my kingdom is from another place.” (John 18:36)

Thank God, we’re not back in the Old Covenant! Jesus’ ways are different.

*At other times, he told them not to engage in physical warfare.