Matthew 1:18 - Coke's Commentary on the Holy Bible

Now the birth of Jesus Christ, &c.— Now the birth of Jesus Christ was in this manner; literally, was thus; not only the birth, but the conception of Christ, and what preceded it, are here included, in the word γεννησις, which we translate birth, and which some critics have unwarily confused with the word γενεσις, generation, used in the first verse of this chapter. Among the Jews there was a considerable space of time (generally a year, or six months) between the betrothing or wedding; and during this space of time it was that Mary was found with child by the power of the Holy Ghost. See Luke 1:26. The last clause of the verse is better rendered by some, She was found to be pregnant, or with child, by the Holy Ghost.