And Joseph also went up from Galilee, out of the city of Nazareth, into Judea, unto the city of David, which is called Bethlehem; (because he was of the house and lineage of David:)
All Commentaries on Luke 2:4 Go To Luke 2
George Leo Haydock
AD 1849
The evangelist here mentions the city of David, to remind us how exactly that was fulfilled, which God promised to David, that an everlasting king should be born of him: and the reason why the inspired writer was content to mention the relationship between Joseph and David, omitting that of the Blessed Virgin and the royal prophet, was, because in the law it was commanded that persons of the same family should intermarry; hence it is added in the subsequent verse, with Mary, his espoused wife. (St. Iren us, hær. lib. iii. chap. 11.)