The census of those on the ark included Noah, Shem, Ham, and Japheth, Noah’s wife, and the three wives of his sons (Genesis 7:13). With these four men and four women, the earth was repopulated after the flood.
While the Jews were subject to various food laws, forbidding to eat several types of food (e.g. pork), the Christian is under no such restriction today.
Let's study the Old Testament...
The birthright was the natural privilege of the firstborn son. Receiving the birthright, the firstborn would become the head of the family, and would have charge of the family, including the family property.
Some books you can take or leave one way or the other, and it won't make much difference. The Bible is not in that category. If you 'leave' it, you've lost the most important body of information in the world-and the key to your access to heaven. If you 'take' it (to be the Word of God), you labor under the serious responsibility of understanding as much of it as you possibly can.