A chapter in Wafayat al-Ayan on another grammarian of Baṣra, Abu Amr Isa ibn Omar ath-Thakafi, reports that al-Khalīl Ibn Aḥmad had heard from Sibawaih, an erstwhile student of ath-Thakafi, that ath-Thakafi had the authored over seventy works on grammar, all but two of which were lost by a collector in Fars. The two titles survived were Ikmāl (completion) that remained then in Fars, and 'al-Jāmī' (the collector), that Sibawaih was in possession of and studying in the course of composing his own treatise, the famous ". Al-Khalīl claim here is that: