Charles Ellicott Commentary Genesis 7:13

"In the selfsame day entered Noah, and Shem, and Ham, and Japheth, the sons of Noah, and Noah`s wife, and the three wives of his sons with them, into the ark;" — Genesis 7:13 (ASV)

In the very same day. —Hebrew, in the bone of this day. (See Note on Genesis 2:23.)