Luke
Luke 1:26ESV·traditional attribution

In the sixth month the angel Gabriel was sent from God to a city of Galilee named Nazareth,

John Calvin Reformed @genevareformer

26. Now in the sixth month It was a wonderful dispensation of the divine purpose, and far removed from the ordinary judgment of men, that God determined to make the beginning of the generation of the herald more illustrious than that of his own Son.

Matthew Henry Presbyterian @wholebiblehenry

We have here notice given us of all that it was fit we should know concerning the incarnation and conception of our blessed Saviour, six months after the conception of John. The same angel, Gabriel, that was employed in making known to Zacharias God's purpose concerning his son, is employed in this also; for in this, the same glorious work of redemption, which was begun in that, is carried on.

Commenting on Luke 1:26-38

John Gill Reformed Baptist @doctorgill

And in the sixth month,.... After Elisabeth's conception; for so long was John the Baptist conceived before Christ, and so long he was born before him; and it seems as if there was the same distance between the public ministry of the one, and the other: John was before Christ, as man, being his forerunner; but Christ was preferred unto him as mediator, and existed...