Ramban on Genesis 6:22/רמב"ן על בראשית ו׳:כ״ב

1AND NOAH DID THUS; ACCORDING TO ALL THAT G-D HAD COMMANDED HIM, meaning that he constructed the ark and gathered the food. Scripture’s intent in saying, And Noah did… so did he, is to explain that he did not omit a thing from all that G-d had commanded him.