Parable of the fig tree

Mark 13:28a Now learn a parable of the fig tree; Matt 24:32a Now learn a parable of the fig tree; Luke 21:29a And he spake to them a parable;
Mark 13:28b When her branch is yet tender, and putteth forth leaves, ye know that summer is near: Matt 24:32b When his branch is yet tender, and putteth forth leaves, ye know that summer is nigh: Luke 21:29b Behold the fig tree, and all the trees; 30 When they now shoot forth, ye see and know of your own selves that summer is now nigh at hand.
Mark 13:29 So ye in like manner, when ye shall see these things come to pass, know that it is nigh, even at the doors. Matt 24:33 So likewise ye, when ye shall see all these things, know that it is near, even at the doors. Luke 21:31 So likewise ye, when ye see these things come to pass, know ye that the kingdom of God is nigh at hand.
Mark 13:30 Verily I say unto you, that this generation shall not pass, till all these things be done. Matt 24:34 Verily I say unto you, This generation shall not pass, till all these things be fulfilled. Luke 21:32 Verily I say unto you, This generation shall not pass away, till all be fulfilled.
Mark 13:31 Heaven and earth shall pass away: but my words shall not pass away [1]. Matt 24:35 Heaven and earth shall pass away, but my words shall not pass away [1]. Luke 21:33 Heaven and earth shall pass away: but my words shall not pass away [1].
Mark 13:32 But of that day and that hour knoweth no man, no, not the angels which are in heaven, neither the Son, but the Father. Matt 24:36 But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only.
       

[1]Isaiah 51:6 Lift up your eyes to the heavens, and look upon the earth beneath: for the heavens shall vanish away like smoke, and the earth shall wax old like a garment, and they that dwell therein shall die in like manner: but my salvation shall be for ever, and my righteousness shall not be abolished (Interpreter's One-Volume Commentary, p. 665).