1. Muhammad ibn al-Hasan ibn Ahmad ibn al-Walid said: Muhammad ibn al-Hasan alSaffar on the authority of Ahmad ibn Muhammad ibn `Isa on the authority of his father on the authority of Sa`id ibn Janah on the authority of some of our scholars that Abu `Abd Allah al-Sadiq said: Among the smallest things crated by Allah is the mosquito [ba`ud], and the gnat [jirjis], which is smaller than the mosquito. And that what you name [al-walgh], which is even smaller than a gnat. What is in an elephant is found in a mosquito; except for the mosquito has been given preference over the elephant by two wings.