Mas’ala 1782مختصر المزنيShafi'ivol. 1, p. 206vol. 1, p. 206 وَإِنْ تَطَوَّعَ بِالضَّمَانِ لَمْ يَرْجِعْ. Read the whole chapterCopy with source On the map: GuaranteeCompare