1) The unforgivable sin is mentioned by Jesus (Mark 3:29) when the evil religious leaders full of jealousy and venom called Jesus' miracles the work of Satan which was ironic because Jesus knew that they were children of the devil (John 8:34). 2) Christians cannot commit an unforgivable sin unless they completely reject Jesus. 3) God can forgive anyone provided they don't reject Jesus, who is God's way of salvation.