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And Abram fell on his face: and God talked with him, saying...
It says that Abram fell on his face when God talked with him. Now, it doesn't say that there was any such law as that, in this instance, Abram was supposed to fall on his face, or anything like that. Rather, it demonstrates that Abram has a genuine personal faith in, and relationship with God, from his heart. That is what makes the difference, not keeping the letter of the law.