Do not worry

Therefore I say unto you, Take no thought for your life, what ye shall eat, or what ye shall drink; nor yet for your body, what ye shall put on. Is not the life more than meat, and the body than raiment?
Matthew 6:25

Barnes' Notes on the Bible
Therefore I say unto you, Take no thought ... - The general design of this paragraph, which closes the chapter, is to warn his disciples against avarice, and, at the same time, against anxiety about the supply of their needs. This he does by four arguments or considerations, expressing by unequalled beauty and force the duty of depending for the things which we need on the providence of God. The "first" is stated in Matthew 6:25; "Is not the life more than meat, and the body than raiment?" In the beginning of the verse he charged his disciples to take "no thought" - that is, not to be "anxious" about the supply of their wants. In illustration of this he says that God has given "life," a far greater blessing than "meat;" that he has created the body, of far more consequence than raiment. Shall not he who has conferred the "greater" blessing be willing to confer the "less?" Shall not he who has formed the body so curiously, and made in its formation such a display of power and goodness, see that it is properly protected and clothed? He who has displayed "so great" goodness as to form the body, and breathe into it the breath of life, will surely "follow up" the blessing, and confer the "smaller" favor of providing that that body shall be clothed, and that life preserved. No thought - The word "thought," when the Bible was translated, meant "anxiety," and is so used frequently in Old English authors. Thus, Bacon says, "Haweis died with 'thought' and anguish before his business came to an end." As such it is used here by our translators, and it answers exactly to the meaning of the original. Like many other words, it has since somewhat changed its signification, and would convey to most readers an improper idea. The word "anxiety" would now exactly express the sense, and is precisely the thing against which the Saviour would guard us. See Luke 8:14; Luke 21:34; Philippians 4:6. "Thought" about the future is right; "anxiety, solicitude, trouble" is wrong. There is a degree of "thinking" about the things of this life which is proper. See 1 Timothy 5:8; 2 Thessalonians 3:10; Romans 12:11. But it should not be our supreme concern; it should not lead to anxiety; it should not take time that ought to be devoted to religion. For your life - For what will "support" your life. Meat - This word here means "food" in general, as it does commonly in the Bible. We confine it now to animal food. When the Bible was translated, it denoted all kinds of food, and is so used in the old English writers. It is one of the words which has changed its meaning since the translation of the Bible was made. Raiment - Clothing.

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Clarke's Commentary on the Bible
Therefore - Δια τουτο, on this account; viz., that ye may not serve mammon, but have unshaken confidence in God, I say unto you, - Take no thought - Be not anxiously careful, μη μεριμνατε; this is the proper meaning of the word. μεριμνα anxious solicitude, from μεριζειν τον νουν dividing or distracting the mind. My old MS. Bible renders it, be not bysy to your liif. Prudent care is never forbidden by our Lord, but only that anxious distracting solicitude, which, by dividing the mind, and drawing it different ways, renders it utterly incapable of attending to any solemn or important concern. To be anxiously careful concerning the means of subsistence is to lose all satisfaction and comfort in the things which God gives, and to act as a mere infidel. On the other hand, to rely so much upon providence as not to use the very powers and faculties with which the Divine Being has endowed us, is to tempt God. If we labor without placing our confidence in our labor, but expect all from the blessing of God, we obey his will, co-operate with his providence, set the springs of it a-going on our behalf, and thus imitate Christ and his followers by a sedate care and an industrious confidence. In this and the following verses, our Lord lays down several reasons why men should not disquiet themselves about the wants of life, or concerning the future. The first is, the experience of greater benefits already received. Is not the life more than meat, and the body than raiment? Can he who gave us our body, and breathed into it the breath of life, before we could ask them from him, refuse us that which is necessary to preserve both, and when we ask it in humble confidence? The clause what ye must eat, is omitted by two MSS., most of the ancient versions, and by many of the primitive fathers. Griesbach has left it in the text with a note of doubtfulness. It occurs again in Matthew 6:31, and there is no variation in any of the MSS. in that place. Instead of, Is not the life more than, etc., we should read, Of more value; so the word πλειον is used in Numbers 22:15, and by the best Greek writers; and in the same sense it is used in Matthew 21:37. See the note there.

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Gill's Exposition of the Entire Bible
Therefore I say unto you, take no thought for your life,.... Since ye cannot serve both God and "mammon", obey one, and neglect the other. Christ does not forbid labour to maintain, support, and preserve, this animal life; nor does he forbid all thought and care about it, but all anxious, immoderate, perplexing, and distressing thoughts and cares; such as arise from diffidence and unbelief, and tend to despair; which are dishonourable to God, as the God of nature and providence, and uncomfortable to men: what ye shall eat, or what ye shall drink, nor yet for your body, what ye shall put on. The several and the only things, which are necessary for the support and comfort of human life, are mentioned; as meat, drink, and clothing; Eating and drinking are necessary to preserve life; and raiment, to cover and defend the body, from the injuries of the heavens: and having these, men have everything necessary, and ought herewith to be content; nor should they be anxiously thoughtful about these: for is not the life more than meat, and the body than raiment? And yet, God has given these without man's thought: and since these are better, and much more excellent, than food and raiment, as all must and will acknowledge; and God has given these the greater gifts, it may be depended upon, that he will give the lesser; that he will give meat and drink; to uphold that valuable life, which he is the author of; and raiment to clothe that body, which he, with so much wisdom and power, has accurately and wonderfully made.