___ is the most primary source of Seerah.

The most primary source of Seerah (the biography of Prophet Muhammad PBUH) is the work of Ibn Ishaq. His comprehensive work, 'Sirat Rasul Allah' (The Life of the Messenger of God), is the earliest and most detailed account available. Although the original manuscript is lost, it was preserved and transmitted by later scholars, most notably Ibn Hisham, who edited and abridged it.

• Zad al-Maad is a later work by Ibn al-Qayyim, not a primary source.
• Ibn Hisham is crucial for preserving and transmitting Ibn Ishaq's work, but Ibn Ishaq is the original primary author.
• Insan al-Uyun is also a later biographical work by Ali ibn Burhanuddin al-Halabi.