"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
"Even so, when you see all these things, you know that it is near, right at the door. This generation shall not pass, till all these things be fulfilled."
Mt 24:34
"Even so, when you see these things happening, you know that it is near, right at the door. This generation shall not pass, till all these things be done. "
Mk 13:30
"Even so, when you see these things happening, you know that the kingdom of God is near. This generation shall not pass away, till all be fulfilled."
Lk 21:31
These are my favorite, because they quickly end all modern speculations and self-proclaimed end-times teachers and prophets.