WITNESS

Kitāb fī annahu idhā waqaʿa khaṭṭ mustaqīm ʿalá khaṭṭayn mustaqīmayn fa-ṣayyara al-zāwiyatayn allatayn fī jihah wāḥidah aqall min qāʾimatayn fa-inna al-khaṭṭayn iltaqayā idhā ukhrijā fī tilka al-jihāh_Cairo_Dār al-kutub_Muṣṭafā Fāḍil riyāḍa_40