Then the angel replied to her, “The Holy Spirit will come upon you, and the power of the Most High will overshadow you [like a cloud]; for that reason the holy (pure, sinless) Child shall be called the Son of God. [Ex 40:34; Is 7:14]
In the days of Herod [the Great], king of Judea, there was a certain priest whose name was Zacharias, of the division of Abijah. His wife was a descendant of Aaron [the first high priest of Israel], and her name was Elizabeth.
By faith even Sarah herself received the ability to conceive [a child], even [when she was long] past the normal age for it, because she considered Him who had given her the promise to be reliable and true [to His word]. [Gen 17:19; 18:11-14; 21:2]