{Till they see} (he(9373) an id(9373)in). Second aorist active
subjunctive with he(9373) and an referring to the future, an
idiomatic construction. So in  Mr 9:1  Mt 16:28 . In all three
passages "shall not taste of death" (ou m(8820)geus(936e)tai thanatou,
double negative with aorist middle subjunctive) occurs also.
Rabbinical writings use this figure. Like a physician Christ
tasted death that we may see how to die. Jesus referred to the
cross as "this cup" ( Mr 14:36  Mt 26:39  Lu 22:42 ). Mark speaks
of the kingdom of God as "come" (el(886c)uthuian, second perfect
active participle). Matthew as "coming" (erchomenon) referring
to the Son of man, while Luke has neither form. See Matthew and
Mark for discussion of the theories of interpretation of this
difficult passage. The Transfiguration follows in a week and may
be the first fulfilment in the mind of Jesus. It may also
symbolically point to the second coming.