Proverbs 27:1

Do not make a noise about tomorrow, for you are not certain what a day's outcome may be.

Luke 12:19-20

And I will say to my soul, Soul, you have a great amount of goods in store, enough for a number of years; be at rest, take food and wine and be happy.

James 4:13-16

How foolish it is to say, Today or tomorrow we will go into this town, and be there for a year and do business there and get wealth:

1 Samuel 28:19

And more than this, the Lord will give Israel up with you into the hands of the Philistines: and tomorrow you and your sons will be with me: and the Lord will give up the army of Israel into the hands of the Philistines.

Psalm 95:7

For he is our God; and we are the people to whom he gives food, and the sheep of his flock. Today, if you would only give ear to his voice!

Isaiah 56:12

Come, they say, I will get wine, and we will take strong drink in full measure; and tomorrow will be like today, full of pleasure.

2 Corinthians 6:2

(For he says, I have given ear to you at a good time, and I have been your helper in a day of salvation: see, now is the good time; now is the day of salvation):

Treasury of Scripture Knowledge

Summary

Boast not thyself of to morrow; for thou knowest not what a day may bring forth.

Bible References

Boast

Psalm 95:7
For he is our God; and we are the people to whom he gives food, and the sheep of his flock. Today, if you would only give ear to his voice!
Isaiah 56:12
Come, they say, I will get wine, and we will take strong drink in full measure; and tomorrow will be like today, full of pleasure.
Luke 12:19
And I will say to my soul, Soul, you have a great amount of goods in store, enough for a number of years; be at rest, take food and wine and be happy.
2 Corinthians 6:2
(For he says, I have given ear to you at a good time, and I have been your helper in a day of salvation: see, now is the good time; now is the day of salvation):
James 4:13
How foolish it is to say, Today or tomorrow we will go into this town, and be there for a year and do business there and get wealth:

Thou

1 Samuel 28:19
And more than this, the Lord will give Israel up with you into the hands of the Philistines: and tomorrow you and your sons will be with me: and the Lord will give up the army of Israel into the hands of the Philistines.

General references

Leviticus 8:32
And that which is over of the flesh and of the bread is to be burned with fire.
Proverbs 3:28
Say not to your neighbour, Go, and come again, and tomorrow I will give; when you have it by you at the time.
James 4:16
But now you go on glorying in your pride: and all such glorying is evil.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain