(Matthew 10:34) - "Do not think that I came to bring peace on the earth; I did not come to bring peace, but a sword. 35"For I came to set a man against his father, and a daughter against her mother, and a daughter-in-law against her mother-in-law; 36and a man’s enemies will be the members of his household."
(Luke 12:51) - "Do you suppose that I came to grant peace on earth? I tell you, no, but rather division; 52for from now on five members in one household will be divided, three against two, and two against three..."
And from the Gospel of Thomas:
16. Jesus said, "Perhaps people think that I have come to cast peace upon the world. They do not know that I have come to cast conflicts upon the earth: fire, sword, war.
For there will be five in a house: there'll be three against two and two against three, father against son and son against father, and they will stand alone."