| Religion: | Islam |
| Era: | Islamic golden age |
| Abu Ubaid | |
| Birth Date: | c. 154 AH/770 CE |
| Birth Place: | Herat, Abbasid Caliphate |
| Death Date: | 224 AH/838 (aged 68) |
| Death Place: | Mecca, Abbasid Caliphate |
| Denomination: | Sunni |
| Creed: | Shafi‘i |
| Ethnicity: | Arab |
| Main Interests: | History, Tafsir, Hadith, Fiqh |
| Influences: | al-Asmaʿi, Abu ʿUbayda, Sa'id ibn Aws al-Ansari, Abu ʿAmr al-Shaybani, al-Kisa'i, al-Farra and others |
Abu Ubaid al-Qasim ibn Sallam al-Khurasani al-Harawi (Arabic: أبو عبيد القاسم بن سلاّم الخراساني الهروي|Abū ‘Ubayd al-Qāsim ibn Sallām al-Khurāsānī al-Harawī; c. 770–838) was an Arab philologist and the author of many standard books on lexicography, Qur’anic sciences, hadith, and fiqh.
He was born in Herat, the son of a Byzantine slave. He left his native town and studied philology at the Basra school under many famous scholars such as al-Asmaʿi (d. 213/828), Abu ʿUbayda (d. c.210/825), and Abu Zayd al-Ansari (d. 214 or 215/830–1), and at the Kufa school under Abu ʿAmr al-Shaybani (d. c.210/825), al-Kisaʾi (d. c.189/805), and others.
He was the first to develop a recorded science for tajwid, giving the rules of tajwid names and putting it into writing in his book called al-Qirā'āt. He wrote about 25 reciters, including the 7 mutawatir reciters.[1] He made the reality, transmitted through reciters of every generation, a science with defined rules, terms, and enunciation.[2] [3] He wrote extensively on the originally revealed, but then abrogated, verses from the Qur’an. [4] [5]