John 9:4

9:4 We must perform the deeds of the one who sent me as long as it is daytime. Night is coming when no one can work.

John 12:35-36

12:35 Jesus replied, “The light is with you for a little while longer. Walk while you have the light, so that the darkness may not overtake you. The one who walks in the darkness does not know where he is going. 12:36 While you have the light, believe in the light, so that you may become sons of light.” When Jesus had said these things, he went away and hid himself from them.

Hebrews 3:13-15

3:13 But exhort one another each day, as long as it is called “Today,” that none of you may become hardened by sin’s deception. 3:14 For we have become partners with Christ, if in fact we hold our initial confidence firm until the end. 3:15 As it says, “Oh, that today you would listen as he speaks! Do not harden your hearts as in the rebellion.”