"Hebrews 8:13 "In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away." [KJV]
"By calling this covenant new, he has made the first one obsolete; and what is obsolete and aging will soon disappear." [NIV]
Jesus reduced the entire OT to two commandments (from the Old Testament) -- love God with all your heart and soul and mind; and your neighbor as yourself. If you could, you would not have to worry about the rest.
Again, it is not the OT testament but its interpretation that was discarded and made obsolete. The circumcision is not of the flesh but of the heart, and the blood of animals cannot atone for our sins. The Hebrews were given the right stuff but had it wrong. Christianity is defined by the New Testament, which interprets the Old in the way the Hebrews didn't. Therefore, the OT, as interpreted by the Hebrews, is discarded, because it was made imperfect (corrupt) by the Hebrews
"For if there had been nothing wrong with that first covenant, no place would have been sought for another. But God found fault with the people..." [NIV, Heb 8:7-8]
Through the NT we recognize that "the Law made " [NIV, Heb 6:19]
Again, read Matthew 5:38 and see where Jesus directly reinterprets Exodus 21:24 and renders it null and void.
Read also Luke 13:14 for a better insight into the Hebrew's mindset: you can't be sick on a Sabbath; you will just have to pick another day!
"There are six days for work. So come and be healed on those days, not on the Sabbath.
Need we say more?