Proverbs 27:1
"Boast not thyself of to morrow; for thou knowest not what a day may bring forth."
Cross References (ranked by relevance)
(For he saith, I have heard thee in a time accepted, and in the day of salvation have I succoured thee: behold, now is the accepted time; behold, now is the day of salvation.)
Come ye, say they, I will fetch wine, and we will fill ourselves with strong drink; and to morrow shall be as this day, and much more abundant.
Moreover the LORD will also deliver Israel with thee into the hand of the Philistines: and to morrow shalt thou and thy sons be with me: the LORD also shall deliver the host of Israel into the hand of the Philistines.
For he is our God; and we are the people of his pasture, and the sheep of his hand. To day if ye will hear his voice,