To be taxed with Mary his espoused wife, being great with child. With Mary his espoused wife - There was no necessity for Mary to have gone to Bethlehem, as Joseph's presence could have answered the end proposed in the census as well without Mary as with her; but God so ordered it, that the prophecy of Micah should be thus fulfilled, and that Jesus should be born in the city of David; Micah 5:2.
Related Commentaries of Luke 2:5
Luke 2:5
5 To be taxedc with Mary his espoused wife, being great with child.