כירק עשב. שיש שהוא ראוי לאכול ויש שאינו ראוי לאכול, כך בהמות חיות עופות ודגים יש מהן ראויין ויש מהן שאינן ראויין. כירק עשב, “as if it were green grass.” Such grass had been permitted for man to eat ever since his creation. Just as some grass had never been fit to eat,though not forbidden,so some living creatures as well as fish and fowl would be permitted as food, whereas others would not because they are not suitable as such.
נתתי לכם את כל. מאחר שניצלו בתיבה שעשיתם ועל ידכם באה להם הצלה הרי הם בידכם לעשות להם כטוב בעיניכם. נתתי לכם את כל, “I have allocated it all to you in a similar manner.” The reason why G-d permitted eating living creatures after they had been killed, was that all of them had to thank man for having kept them from perishing during the deluge. As a result, all the animals were now totally at the mercy of man.