أبو داود
Abu Ishaq Ibrahim ibn Ya'qub ibn Ishaq al-Sa'di al-Juzajani (, born around 180 AH – died 872 CE/259 AH) was a Muslim hadith scholar, one of the imams of al-jarh wa al-ta'deel and a student of Ahmad ibn Hanbal. Some of the hadith scholars that transmitted his narrations include Abu Dawood, al-Tirmidhi and al-Nasa'i.