Matthew Ch 5:
Adultery
27"You have heard that it was said, 'Do not commit adultery.'[e] 28But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart. 29If your right eye causes you to sin, gouge it out and throw it away. It is better for you to lose one part of your body than for your whole body to be thrown into hell. 30And if your right hand causes you to sin, cut it off and throw it away. It is better for you to lose one part of your body than for your whole body to go into hell.
Divorce
31"It has been said, 'Anyone who divorces his wife must give her a certificate of divorce.'[f] 32But I tell you that anyone who divorces his wife, except for marital unfaithfulness, causes her to become an adulteress, and anyone who marries the divorced woman commits adultery.
Oaths
33"Again, you have heard that it was said to the people long ago, 'Do not break your oath, but keep the oaths you have made to the Lord.' 34But I tell you, Do not swear at all: either by heaven, for it is God's throne; 35or by the earth, for it is his footstool; or by Jerusalem, for it is the city of the Great King. 36And do not swear by your head, for you cannot make even one hair white or black. 37Simply let your 'Yes' be 'Yes,' and your 'No,' 'No'; anything beyond this comes from the evil one.
An Eye for an Eye
38"You have heard that it was said, 'Eye for eye, and tooth for tooth.'[g] 39But I tell you, Do not resist an evil person. If someone strikes you on the right cheek, turn to him the other also. 40And if someone wants to sue you and take your tunic, let him have your cloak as well. 41If someone forces you to go one mile, go with him two miles. 42Give to the one who asks you, and do not turn away from the one who wants to borrow from you.
Matthew, Ch 6
Fasting
16"When you fast, do not look somber as the hypocrites do, for they disfigure their faces to show men they are fasting. I tell you the truth, they have received their reward in full. 17But when you fast, put oil on your head and wash your face, 18so that it will not be obvious to men that you are fasting, but only to your Father, who is unseen; and your Father, who sees what is done in secret, will reward you.