Theophylact of Ohrid

Then, in order to remove the fear that comes with humility, he says: do not be afraid, but cast all your care upon the Lord, for He cares, that is, He is concerned about all this.

Commentary on 1 Peter ↗

Oecumenius

Then, removing the fear that would arise from humiliation (for perhaps he saw some fearing that by humbling themselves in this present life, they would suffer some evil), he said: "Do not be afraid, casting all your anxiety on the Lord, when you have entrusted yourself to him who will take careful and diligent care of you." "because he cares for you," or concern is placed upon him regarding all these things.

Commentary on 1 Peter ↗

Desert Fathers

A brother asked a hermit, 'Would you like me to keep two shillings for myself, in case I fall ill?' The hermit, seeing that in his heart he wanted to keep them, said, 'Yes.' The brother went into his cell, but he was worried, asking himself, 'Did he tell me the truth or not?' He got up and went back to the hermit, bowed down and asked him, 'For the Lord's sake tell me the truth, for I am worrying about those two shillings.' The hermit said to him, 'I told you to keep them because I saw you intended to do so anyway. …

The Desert Fathers, Sayings of the Early Christian Monks ↗