'Contend with Him' in the Bible

Rise ye up, take your journey, and pass over the river Arnon: behold, I have given into thine hand Sihon the Amorite, king of Heshbon, and his land: begin to possess it, and contend with him in battle.

If he will contend with him, he cannot answer him one of a thousand.

That which hath been is named already, and it is known that it is man: neither may he contend with him that is mightier than he.

But thus saith the LORD, Even the captives of the mighty shall be taken away, and the prey of the terrible shall be delivered: for I will contend with him that contendeth with thee, and I will save thy children.