Mark 13:29-31

Amplified Bible

²⁹ Even so, you too, when you see these things happening, know [for certain] that He is near, right at the door. ³⁰ I assure you and most solemnly say to you, this generation [the people living when these signs and events begin] will not pass away until all these things take place. ³¹ Heaven and earth [as now known] will ^[a]pass away, but My words will not pass away.