Matthew 6 - Anxious and worry are a product of faithlessness, trust in Him in all things.

Mat 6:25
"For this reason I say to you, do not be anxious for your life, as to what you shall eat, or what you shall drink; nor for your body, as to what you shall put on. Is not life more than food, and the body than clothing?
These words of Yeshua are absolutely magnificent. These words are reminiscent of Israel wandering in the wilderness and how Elohim provided food and drink for them, as well as not letting their clothing wear out. We should not be near as concerned with how we will be provided for as much as we should concern ourselves with how we should live.
Mat 6:26
"Look at the birds of the air, that they do not sow, neither do they reap, nor gather into barns, and yet your heavenly Father feeds them. Are you not worth much more than they?
Yeshua is referencing the book of Job Job 38:41) and the Psalms (Psalm 104:11-28, 145:15-16, 147:7-11).
Mat 6:27
"And which of you by being anxious can add a single cubit to his life's span?
Yeshua is again quoting the Psalms (Psalm 39:4-6).
Mat 6:28
"And why are you anxious about clothing? Observe how the lilies of the field grow; they do not toil nor do they spin,
Mat 6:29
yet I say to you that even Solomon in all his glory did not clothe himself like one of these.
Mat 6:30
"But if God so arrays the grass of the field, which is alive today and tomorrow is thrown into the furnace, will He not much more do so for you, O men of little faith?
Mat 6:31
"Do not be anxious then, saying, 'What shall we eat?' or 'What shall we drink?' or 'With what shall we clothe ourselves?'
All these beautiful words of Yeshua are based upon His Father's written Word (Psalm 78:18-25). Which makes complete sense because He is His Father's Word made flesh.
Mat 6:32
"For all these things the Gentiles eagerly seek; for your heavenly Father knows that you need all these things.
Mat 6:33
"But seek first His kingdom and His righteousness; and all these things shall be added to you.
We should seek first, His kingdom and His righteousness (Psalm 34:9-10). Then all these things will be given to us. We should thoroughly trust in Him and thoroughly walk in His ways.
Mat 6:34
"Therefore do not be anxious for tomorrow; for tomorrow will care for itself. Each day has enough trouble of its own.
Anxious and worry are a product of faithlessness. Let us trust in Him in all things.