Remember that Joseph also came from the line of David, but since there was a curse in his bloodline (Jehoiachin), he could not have had a part in the conception.
Beesha Yuusuf Daa'uud ayaa ku doodeysa inay xaq u leedahay inay iyada kursigan hesho, maadaama Beesha Isaaq Daa'uud ay xubin ka heshay Aqalka Sare, sidaas darteed ay muhiim tahay in liiska musharaxiinta laga saaro beesha Isaaq Daa'uud, si aanay labo kursi ugu helin.