The Lord Jesus Christ taught straight out of the law-one, of many:
Mark 12 KJV
28 And one of the scribes came, and having heard them reasoning together, and perceiving that he had answered them well, asked him, Which is the first commandment of all? 29 And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord: 30 and thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment. 31 And the second is like, namely this, [U]Thou shalt love thy neighbour as thyself[/U]. There is none other commandment greater than these.
Lev 19 KJV
And the Lord spake unto Moses, saying, 2 Speak unto all the congregation of the children of Israel, and say unto them, Ye shall be holy: for I the Lord your God am holy.
3 Ye shall fear every man his mother, and his father, and keep my sabbaths: I am the Lord your God.
4 Turn ye not unto idols, nor make to yourselves molten gods: I am the Lord your God.
5 And if ye offer a sacrifice of peace offerings unto the Lord, ye shall offer it at your own will. 6 It shall be eaten the same day ye offer it, and on the morrow: and if ought remain until the third day, it shall be burnt in the fire. 7 And if it be eaten at all on the third day, it is abominable; it shall not be accepted. 8 Therefore every one that eateth it shall bear his iniquity, because he hath profaned the hallowed thing of the Lord: and that soul shall be cut off from among his people.
9 And when ye reap the harvest of your land, thou shalt not wholly reap the corners of thy field, neither shalt thou gather the gleanings of thy harvest. 10 And thou shalt not glean thy vineyard, neither shalt thou gather every grape of thy vineyard; thou shalt leave them for the poor and stranger: I am the Lord your God.
11 Ye shall not steal, neither deal falsely, neither lie one to another.
12 And ye shall not swear by my name falsely, neither shalt thou profane the name of thy God: I am the Lord.
13 Thou shalt not defraud thy neighbour, neither rob him: the wages of him that is hired shall not abide with thee all night until the morning.
14 Thou shalt not curse the deaf, nor put a stumblingblock before the blind, but shalt fear thy God: I am the Lord.
15 Ye shall do no unrighteousness in judgment: thou shalt not respect the person of the poor, nor honour the person of the mighty: but in righteousness shalt thou judge thy neighbour.
16 Thou shalt not go up and down as a talebearer among thy people: neither shalt thou stand against the blood of thy neighbour: I am the Lord.
17 Thou shalt not hate thy brother in thine heart: thou shalt in any wise rebuke thy neighbour, and not suffer sin upon him.
18 Thou shalt not avenge, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am the Lord.