Mark 13:30
Truly I tell you, this generation will certainly not pass away until all these things have happened — the generation saying is the Olivet Discourse's most discussed verse. This generation will not pass away: the Greek genea can mean the biological generation (approximately 40 years, fulfilled by the 70 CE destruction) or the broader epoch. If the verse refers to the temple destruction, the 40-year window fits exactly; if it refers to the cosmic coming of the Son of Man, the interpretation is more complex.