Luke 17:1-6 NRSV
Jesus said to his disciples, “Occasions for stumbling are bound to come, but woe to anyone by whom they come! It would be better for you if a millstone were hung around your neck and you were thrown into the sea than for you to cause one of these little ones to stumble. Be on your guard! If another disciple sins, you must rebuke the offender, and if there is repentance, you must forgive. And if the same person sins against you seven times a day, and turns back to you seven times and says, ‘I repent,’ you must forgive.”
The apostles said to the Lord, “Increase our faith!” The Lord replied, “If you had faith the size of a mustard seed, you could say to this mulberry tree, ‘Be uprooted and planted in the sea,’ and it would obey you.
NRSV: New Revised Standard Version