5:13 When Joshua was by Jericho, he lifted up his eyes and looked, and behold, a man stood in front of him with his sword drawn in his hand. Joshua went to him and said to him, “Are you for us, or for our enemies?”
Jesus Christ is believed to have appeared in the Old Testament. Key examples include Jesus appearing as the divine Angel of the Lord to figures like Hagar, Moses, and Gideon. Understanding these appearances supports the view that Jesus' divinity and presence are consistent throughout both the Old and New Testaments.
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Allah has a very different character to Yahweh, there is a little overlap but much else that contradicts.
How the Old Testament uses the name of God and how this matches with how Jesus uses it about Himself.