Luke 21:7
"And they asked him, saying, Master, but when shall these things be? and what sign will there be when these things shall come to pass?"
Cross References (ranked by relevance)
But when ye shall see the abomination of desolation, spoken of by Daniel the prophet, standing where it ought not, (let him that readeth understand,) then let them that be in Judaea flee to the mountains:
Verily I say unto you, This generation shall not pass away, till all be fulfilled.
And as he sat upon the mount of Olives, the disciples came unto him privately, saying, Tell us, when shall these things be? and what shall be the sign of thy coming, and of the end of the world?
And one said to the man clothed in linen, which was upon the waters of the river, How long shall it be to the end of these wonders?
And I heard, but I understood not: then said I, O my Lord, what shall be the end of these things?