Charles Spurgeon Commentary Luke 13:4-5

"Or those eighteen, upon whom the tower in Siloam fell, and killed them, think ye that they were offenders above all the men that dwell in Jerusalem? I tell you, Nay: but, except ye repent, ye shall all likewise perish." — Luke 13:4-5 (ASV)

This was a foreshadowing of the overthrow of Jerusalem, and the razing of its walls and towers to the ground, which happened not long after; and even that overthrow of Jerusalem was but a rehearsal of the tremendous doom that shall come upon all who remain impenitent.