Luke 17:1-6

He  said to his disciples, “Offenses will certainly come,   but woe   to the one through whom they come!   It would be better for him if a millstone were hung around his neck and he were thrown into the sea than for him to cause one of these little ones to stumble.   Be   on your guard. If your brother sins,   rebuke   him, and if he repents, forgive   him. And if he sins against you seven times in a day, and comes back to you seven times, saying, ‘I repent,’ you must forgive him.” The  apostles  said to the Lord, “Increase our faith.”  “If you have faith the size of   a mustard seed,”   the Lord said, “you can say to this mulberry tree, ‘Be uprooted and planted in the sea,’ and it will obey you.