John Calvin Commentary Genesis 7:5

"And Noah did according unto all that Jehovah commanded him." — Genesis 7:5 (ASV)

And Noah did according to all that the Lord commanded. This is not a mere repetition of the former sentence; rather, Moses commends Noah’s consistent character of obedience in keeping all God’s commandments. It is as if he would say that in whatever particular it pleased God to test his obedience, he always remained constant.

And certainly, it is not fitting to obey only one or another of God’s commandments, so that when we have performed a defective obedience, we should feel free to withdraw. For we must remember the declaration of James:

He who forbade you to kill, forbade you also to steal, and to commit adultery, (James 2:11).