Matthew 6:34 (various translations)
Give your entire attention to what God is doing right now, and don't get worked up about what may or may not happen tomorrow. God will help you deal with whatever hard things come up when the time comes.
Therefore do not worry about tomorrow, for tomorrow will worry about itself. Each day has enough trouble of its own.
So do not worry or be anxious about tomorrow, for tomorrow will have worries and anxieties of its own. Sufficient for each day is its own trouble.
Don't worry about tomorrow. It will take care of itself. You have enough to worry about today.