Isa 7:13-14 (KJV) And he said, Hear ye now, O house of David; [Is it] a small thing for you to weary men, but will ye weary my God also? Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel.
The Historical Record of Christ’s Birth Explained (Series On SIH Blog): http://wp.me/pU88A-1Ii