Luke 12:10 in the King James Version
And whosoever shall speak a word against the Son of man, it shall be forgiven him: but unto him that blasphemeth against the Holy Ghost it shall not be forgiven.
Context
9 but he who denies me in the presence of men will be denied in the presence of God’s angels.
10 Everyone who speaks a word against the Son of Man will be forgiven, but those who blaspheme against the Holy Spirit will not be forgiven.
11 When they bring you before the synagogues, the rulers, and the authorities, don’t be anxious how or what you will answer or what you will say;