The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
Genesis Chapter 7
clean beast
(See Scofield) - (Gen 6:19).
went in
(See Scofield) - (Gen 6:9).
two of every sort
Compare (Gen 7:2).
In addition to two animals, etc, commanded (Gen 6:19) to be preserved for future increase ("they shall be male and female"), the further command was given more than 100 years later to take of clean beasts, that is, beasts acceptable for sacrifice, seven each. Exodus gives ten such beasts, or but seventy in all. Modern ships carry hundreds of live beasts, with their food, besides scores of human beings.
second month
That is, May.