Circumcision

Why does Jesus bring up circumcision?
To further expose their hypocrisy. They were angry with Jesus for healing a man on the Sabbath when they themselves regularly perform circumcision on eight-day-old boys on the Sabbath in order to adhere to God's commandment that Moses recorded: “And on the eighth day the flesh of his foreskin shall be circumcised” (Leviticus 12:3).

Why does John 7:22 include the phrase, “not that it is from Moses, but from the fathers” about circumcision?
The “fathers” refers to the patriarchs who lived centuries before Moses. Obeying God's command to circumcise didn't begin “from” Moses but from the first patriarch, who was Abraham: “This is My covenant which you shall keep between Me and you and your descendants after you: Every male among you shall be circumcised. And you shall be circumcised in the flesh of your foreskin, and it shall be a sign of the covenant between Me and you. Every son among you who is eight days old shall be circumcised, every male in your generations, he who is born in your house or bought with money from any foreigner who is not your descendant” (Genesis 17:10-12).

Do you know which molecules in the body enable blood to coagulate and clot over wounds?
Vitamin K and prothrombin. Vitamin K induces the liver to produce prothrombin, which enables the blood to clot.

Any guess as to when the levels of vitamin K and prothrombin peak during a man's life?
On the eighth day after birth.

When was this medical discovery made?
It was made and published in 1984 by Dr. S.I. McMillen (McMillen, S.I., M.D. (1984), None of These Diseases (Old Tappan, NJ: Revell)), which was 3,984 years after God told Abraham to circumcise boys on the eighth day. Scientific advances continue to explain God's logic and design found in the Bible (more examples).

Had Jesus broken the law by healing a man on the Sabbath?
Then He departed from there and went into their synagogue. And behold, there was a man who had a shriveled hand. And they asked Him, saying, “Is it lawful to heal on the Sabbath?” - so that they might accuse Him. Then He said to them, “What man is there among you who has one sheep, and if it falls into a pit on the Sabbath, will not lay hold of it and lift it out? How much more valuable then is a man than a sheep? Therefore it is lawful to do good on the Sabbath” (Matthew 12:9-12).