Who said the scribes and Pharisees would be damned to hell because they were children of prophet killers?

Jesus

Woe unto you, scribes and Pharisees, hypocrites! ...

Ye are the children of them which killed the prophets. ...

Ye serpents, ye generation of vipers, how can ye escape the damnation of hell? ...

Upon you may come all the righteous blood shed upon the earth, from the blood of righteous Abel unto the blood of Zacharias son of Barachias, whom ye slew between the temple and the altar. Matthew 23:29-35