Daniel
Daniel 10:13ESV·traditional attribution

The prince of the kingdom of Persia withstood me twenty-one days, but Michael, one of the chief princes, came to help me, for I was left there with the kings of Persia,

John Calvin Reformed @genevareformer

The angel now assigns a reason why he did not appear at once, and at the very first moment to the Prophet, who might complain as follows, — “What treatment is this, to suffer me to consume away through grief for so long a period?” for Daniel had remained through three weeks in succession in the severest affliction.

Matthew Henry Presbyterian @wholebiblehenry

Much ado here is to bring Daniel to be able to bear what Christ has to say to him. Still we have him in a fright, hardly and very slowly recovering himself; but he is still answered and supported with good words and comfortable words. Let us see how Daniel is by degrees brought to himself, and gather up the several passages that are to the same purport. I.

Commenting on Daniel 10:10-21

John Gill Reformed Baptist @doctorgill

But the prince of the kingdom of Persia withstood me one and twenty days,.... Which was just the time Daniel had been mourning and fasting, Dan 10:2, and the angel had had his instructions to acquaint him with the Lord's answer to his prayers: by "the prince of the kingdom of Persia" is not to be understood the then reigning king of Persia, Cyrus, or...