2 Corinthians 1:18-19

18God always does what he says he will do. In the same way, my promise to you was not both ‘Yes’ and ‘No’.

19Silas, Timothy and I told you the message about God's Son, Jesus Christ. Christ is not someone who changes his message between ‘Yes’ and ‘No’. Instead, he always says ‘Yes,’ and he does what he says.