Matthew 6:34 (BSB)

Therefore do not worry about tomorrow, for tomorrow will worry about itself. Today has enough trouble of its own.

From Matthew 6. Also in the ESV.

Commentary on Matthew 6:34

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Matthew 6:25-34: There is scarcely any one sin against which our Lord Jesus more largely and earnestly warns his disciples, or against which he arms them with more variety of arguments, than the sin of disquieting, distracting, distrustful cares about the things of life, which are a bad sign that both the treasure and the heart are on the earth; and therefore he thus largely insists upon it. Here is, I.
• Albert Barnes (Presbyterian), Barnes' New Testament Notes on Matthew 6:34: Verse 34. For Remarks on Chapter 6, , end of verse. (q) "the things of itself"
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Matthew 6:19-34: CONCLUDING ILLUSTRATIONS OF THE RIGHTEOUSNESS OF THE KINGDOM--HEAVENLY-MINDEDNESS AND FILIAL CONFIDENCE. (Mat. 6:19-34) Lay not up for ourselves treasures upon earth--hoard not. where moth--a "clothes-moth." Eastern treasures, consisting partly in costly dresses stored up (Job 27:16), were liable to be consumed by moths (Job 13:28; Isa 50:9; Isa 51:8). In Jam 5:2 there is an evident reference to our Lord's words here.
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Matthew 6:34: Take therefore no thought--anxious care. for the morrow: for the morrow shall take thought for the things of itself--(or, according to other authorities, "for itself")--shall have its own causes of anxiety. Sufficient unto the day is the evil thereof--An admirable practical maxim, and better rendered in our version than in almost any other, not excepting the preceding English ones.