Actually, many times:
"There are some of those standing here, who in no wise shall taste of death, until they have seen the Son of man coming in his kingdom."
Mt 16:27
"there are some of those standing here, who in no wise shall taste of death, until they see the kingdom of God having come in power. "
Mk 8:38
"there are some of those standing here, who in no wise shall taste of death, until they have seen the kingdom of God. "
Lk 9:26-27
"...In no wise will ye have completed the cities of Israel, until the Son of man be come."
Mt 10:23
"This generation shall not pass, till all these things be fulfilled."
Mt 24:34
"this generation shall not pass, till all these things be done. "
Mk 13:30
"This generation shall not pass away, till all be fulfilled. "
Lk 21:22
"...Hereafter shall ye see the Son of man sitting on the right hand of power, and coming in the clouds of heaven. "
Mt 26:64
"O generation of vipers, who hath warned you to flee from the wrath about to come? And now also the axe is laid"
Lk 3:7-9
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There are just two options, generally.
a) We can either ignore teachings of Jesus and of apostles that all is supposed to happen during their time and instead take symbolic prophecies as primary and wait for their literal physical fulfillment (possibly for ever).
b) We can take teachings of Jesus and apostles as primary and let some symbolic prophetical details unresolved (first, we live so long after the events that it is practically impossible for us to solve how these details happened, second, bible prophecies were never "step by step" details fulfilling, but always different from literal readings - they always mixed spiritual realms and physical manifestations).