Jos. 24:15, Lk. 12:16-21, Heb. 4:7, 2 Cor. 6:2

15 And if it is evil in your eyes to serve the Lord, choose this day whom you will serve, whether the gods your fathers served in the region beyond the River, or the gods of the Amorites in whose land you dwell. But as for me and my house, we will serve the Lord.”
Joshua 24:15 (ESV)

16 And he told them a parable, saying, “The land of a rich man produced plentifully, 17 and he thought to himself, ‘What shall I do, for I have nowhere to store my crops?’ 18 And he said, ‘I will do this: I will tear down my barns and build larger ones, and there I will store all my grain and my goods. 19 And I will say to my soul, “Soul, you have ample goods laid up for many years; relax, eat, drink, be merry.” 20 But God said to him, ‘Fool! This night your soul is required of you, and the things you have prepared, whose will they be?’ 21 So is the one who lays up treasure for himself and is not rich toward God.”
Luke 12:16-21 (ESV)

again he appoints a certain day, “Today,” saying through David so long afterward, in the words already quoted,
“Today, if you hear his voice,
do not harden your hearts.”

Hebrews 4:7 (ESV)

 2For he says,
“In a favorable time I listened to you,
and in a day of salvation I have helped you.”
Behold, now is the favorable time; behold, now is the day of salvation.
2 Corinthians 6:2 (ESV)