After them come the personalities of the "tab'inu 't-tabi'in" (the followers of the followers) who laid the foundation of Islamic teachings such as Abu 'l-Aswad Du'ali, the originator of syntax, Khalil ibn Ahmad, the founder of lexicography and the science of rhyme in poetry, Abu Muslim Ma'adh ibn Muslim Al-Hira', the founder of grammar, whose Shi'ism has been admitted even by Siyuti (Al-Muzhir, volume II) and as-Sakit Ya'qub ibn Is'haq, the master of Arabic literature.
Waandishi wengine wanasema kuwa yeye alikuwa ni mfuasi wa Madhehebu ya Kishia na alifariki mwaka 286 H. Al-Qaysarani, hata hivyo, anaandika tarhe ya kifo chake kuwa ni 216 H. na vile vile amechukizwa kwa kuwa Bukhari amechukua riwaya za Isma'il moja kwa moja kutoka kwake katika vitabu vyake mbali na Sahih.